is a group of researchers who study, analyze, and build different aspects of social systems (e.g. social web systems like Twitter, Facebook), including their security and privacy. By understanding and measuring complex networks, we try and build solutions for social good. Our work primarily derives from Data Science, Computational Social Science, Social Computing,
Machine Learning, and Natural Language Processing.

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What's New!

September 2017: PK will be co-organizing a Winter School on User Experience Design.

September 2017: Vivek Gupta, B.Tech. #Classof2019 from IIT Kharagpur, blogs about his experience with us: Precog: The Quintessential Group

September 2017: PK is organizing a Session on Graduate School Application / Admissions on Sept 23, 2017, at IIITD. Interested people (student, professional) should register here for attending the session.

August 2017: Singh, S., Nanda, V., Sen, R., Sengupta, S., Kumaraguru, P., and Gummadi, K. Leveraging Facebook’s Free Basics Engine for Web Service Deployment in Developing Regions (ICTD) 2017, November 16–19, 2017, Lahore, Pakistan. Author's version | Slides.

August 2017: Bhavna Nagpal, B.Tech. Class of 2017 and currently pursing Masters in Design from IIT Guwahati, blogs her experience with us: Pages from a chapter called Precog

August 2017: Prateek Dewan, Ph.D. student becomes one of the 15 researchers from Asia-Pacific region who got selected for NextGen@ICANN60. They will be funded to attend to the ICANN60 in Abu Dhabi, UAE.

August 2017: Arpit Gogia, Graduating class of 2018, B.Tech. from DTU, blogs about his experience with us: The Anatomy of a Precog Internship!

July 2017: Goel, S., Ahuja, S., Subramanyam, A., Kumaraguru, P. #VisualHashtags: Visual Summarization of Social Media Events Using Mid-Level Visual Elements. Accepted at 25th ACM Conference on MultiMedia 2017. Author's version | Slides

July 2017: Call for Ph.D. and Research Associate applications . Apply

July 2017: Ms. Niharika Sachdeva --> Dr. Niharika Sachdeva. Thesis | Slides

July 2017: Dipjyoti Bisharad, Graduating class of 2018, B.Tech. from NIT Silchar, blogs about his experience with us: "A stay of 2 months: An experience of lifetime"

July 2017: Kaushal, R., Chandok, S., Jain, P., Dewan, P., Gupta, N., Kumaraguru, P. Nudging Nemo: Helping Users Control Linkability across Social Networks. Accepted at 9th International Conference on Social Informatics, 2017. Paper

July 2017: Mallika Agarwal blogs her experience with us! "On Precog, PK (and everything else that fits between the two entities)"

July 2017: Mayank Vachher blogs about his experience with Precog: "Standing on the shoulders of giants"

July 2017: Srishti Chandok successfully defended her Masters thesis "User Identities Across Social Networks: Quantifying Linkability and Nudging Users to control Linkability. Thesis

July 2017: Shri Nitin Gadkari, Hon'ble Union Minister of Road Transport & Highways and Shipping makes reference to our research on Selfie Deaths / KillFies! Video

June 2017: Mark dangerous locations in the world using our Saftie & Chat Bot to reduce selfie deaths.

June 2017: PK’s FAQs - Preparing, Applying and Deciding on Graduate Schools.

May 2017: PK is offering the Privacy and Security in Online Social Media (PSOSM) course on NPTEL. Registration started | Teaser Video | Flier.

May 2017: Sonu Gupta successfully defended her M.Tech. thesis at JIIT, advised by Prof. Shelly Sachdeva. Sonu collaborated heavily with Prateek Dewan on this thesis work.

May 2017: Mayank Verma successfully defended his M.Tech. thesis at JIIT. Thesis was co-advised by Anuradha Gupta, faculty at JIIT and PK.

May 2017: Our work on Selfie deaths got captured in an article on Factory Daily, "What makes India the selfie death capital of the world?". PK’s interview on the topic.

Apr, 2017: Precogs won the Honarable Mention at the ICADABAI Hackathon 2017, part of 5th IIMA International Conference on Advanced Data Analysis, Business Analytics, and Intelligence at IIM Ahmedabad held on April 08 - 09, 2017. Team members: Neha, Saravana, Kushagra, Divyansh, Nalin, Sahar.

Apr, 2017: Our paper titled "On the Security and Usability of Dynamic Cognitive Game CAPTCHAs" gets accepted at the Journal on Computer Security (JCS). Authors: Manar Mohamed, Song Gao, Niharika Sachdeva, Nitesh Saxena, Chengcui Zhang, PK, and Paul van Oorschot.

Apr, 2017: Our paper titled "Facebook Inspector (FbI): Towards Automatic Real Time Detection of Malicious Content on Facebook" gets accepted at the Journal of Social Network Analysis and Mining (SNAM). Authors: Prateek and PK.

Apr, 2017: Registrations are now open for "Summer School on Privacy and Security on Online Social Networks" at IIIT Hyderabad, co-organized by Precog! Click here to register.

Feb, 2017: Our full paper submission "From Camera to Deathbed: Understanding Dangerous Selfies on Social Media" got accepted as Poster at The 11th Conference on Web and Social Media (ICWSM) 2017! Authors: Hemank Lamba, Varun Bharadhwaj, Mayank Vachher, Divyansh Agarwal, Megha Arora, Niharika Sachdeva and PK.

Feb, 2017: We are organizing a Summer school on Privacy and Security in Online Social Networks in collaboration with IIIT-Hyderabad during July, 2017.

Jan, 2017: Our paper "A Social Media Based Index of Mental Well-Being in College Campuses" accepted at ACM CHI Conference on Human Factors in Computing Systems. Authors: Shrey, PK, Munmun.

Jan, 2017: Niharika is now on the Program Committee of The Eleventh International Conference on Digital Society and eGovernments ICDS 2017. Congrats Niharika!

Jan, 2017: Indira and Kushagra Singh won the Second Prize in Tool contest at International Conference on Natural Language Processing (ICON), 2016. They built a POS tagger for code mixed data for three language pairs (Hindi-English, Bengali-English and Telegu-English) from Twitter, Facebook and WhatsApp. There were 15 entries for the contest.

Dec, 2016: PK captures his experience of 2016 as a faculty in a blog, "#ProfGiri #LovingMyFacultyLife An amazing year of my faculty life!"

Dec, 2016: Aishwarya N Reganti & Tushar Maheshwari from Indian Institute of Information Technology - IIIT, Sri City visiting us for the month of December. Thanks to Dr. Amitava Das for making this happen.

Nov, 2016: PK blogs about his experience of the Killfie project, "Killed it with a #Killfie: Journey from an Idea to a Global Media Phenomenon".

Nov, 2016: PK blogs about his experience of teaching PSOSM on NPTEL: Teaching #PSOSMonNPTEL in a country of a billion: Experiences and take aways.

Nov, 2016: Our work on Killfie gets featured on the Carnegie Mellon School of Computer Science homepage.

Nov, 2016: Our work "Visual Themes and Sentiment on Social Networks To Aid First Responders During Crisis Events" featured among the week's most thought-provoking papers from arXiv for the week ending November 5, 2016.

Oct, 2016: Our work "Call for Service: Characterizing and Modeling Police Response to Serviceable Requests on Facebook." accepted at the 20th ACM Conference on Computer-Supported Cooperative Work and Social Computing (CSCW), 2016. Authors: Niharika Sachdeva (Ph.D. student), Ponnurangam Kumaraguru (Faculty).

Oct, 2016: Our work on "KidsTube: Detection, Characterization and Analysis of Child Unsafe Content & Promoters on YouTube” accepted at Fourteenth Conference on Privacy, Security, and Trust. Authors: Rishabh Kaushal (Ph.D. student), Srishty Saha (UG student, 2016 graduate), Payal Bajaj (Collaborator at Adobe), Ponnurangam Kumaraguru (Faculty).

Oct, 2016: PK gave a lecture on "Research, Education, and Cybersecurity Policies in India" in a course Cybersecurity Governance: A Data-Driven Approach at Harvard University. Slides.

Oct, 2016: PK gave a ACM Distinguished Speaker talk at IIT Guwahati. Slides.

Sep, 2016: PK gave a Keynote at the Fourth International Symposium on Security in Computing and Communications (SSCC’16). Slides.

Sep, 2016: Our app, The News Bugle is now live as part of the Facebook Freebasics platform. Project in collaboration with MPI-SWS.

Sep, 2016: Dr. Paridhi Jain's new blog "The last blog" capturing her nostalgic 6 years at Precog and IIIT-Delhi.

Aug, 2016: Varun Bharadhwaj blogs about his summer experience with Precog: "Precog: The Phenomenon".

Aug, 2016: PK's new blog "This is Why I Love My Job: Students are the backbone of Faculty life!" capturing the success stories of Precogs!

Aug, 2016: "PicHunt: Social Media Image Retrieval for Improved Law Enforcement" got accepted at 8th International Conference on Social Informatics. Authors: Sonal Goel, Niharika Sachdeva, Ponnurangam Kumaraguru, Prof. A V Subramanyam and Divam Gupta.

Aug, 2016: Prateek Dewan (Ph.D. student), and Shrey Bagroy's (UG student) work on Detecting Malicious Facebook Pages appears in the 5 amazing projects and research ideas from top Indian Universities, Digit Magazine, Aug edition, page 38 - 39 . Physical article.

Aug, 2016: Megha Arora receives TOEFL Scholarship to study Master's in Computer Science at Carnegie Mellon University. This scholarship is given to only 15 students a year!

Aug, 2016: Vedant Das Swain receives 'J.N. Tata Endowment Scholarship for Higher Education' for doing his Master's in Human Computer Interaction at Georgia Tech University

Aug, 2016: Megha Arora receives 'J.N. Tata Endowment Scholarship for Higher Education' for doing her Master's in Computer Science at Carnegie Mellon University. The Jamsetjee Nusserwanjee Tata Endowment was established in 1892. Scholarship is given to selective students and currently there are 4,800 JN Tata Scholars all over the world. ‪

Aug, 2016: Introducing Helix - Understanding the 1,000 words of a picture! Summarize images posted on Facebook in the click of a button! Visit Helix homepage for more details and a demo.

Aug, 2016: Our recent work on "PicHunt: Social Media Image Retrieval for Improved Law Enforcement." Authors: Sonal Goel, Niharika Sachdeva, Ponnurangam Kumaraguru, Prof. A V Subramanyam and Divam Gupta

July, 2016: Srishti's work on Emerging Threats Abusing Phone Numbers Exploiting Cross-Platform Features accepted at 2016 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM) Ph.D. forum.

July, 2016: Our paper Hiding in Plain Sight: Characterizing and Detecting Malicious Facebook Pages accepted at IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM) 2016. Authors: Prateek Dewan, Shrey Bagroy and PK.

June, 2016: PK's Keynote Address on Online Social Media: Opportunities, Challenges, and Pitfalls at IGDTUW.

June, 2016: Our paper Social Media for Safety: Characterizing Online Interactions between Citizens and Police accepted at 30th British Human Computer Interaction Conference (BHCI) 2016. Authors: Niharika Sachdeva, PK and Munmun De Choudhury.

June, 2016: We are co-organizing "Summer Workshop on Online Social Media Developer's Perspective" 6th June - 22nd July at IGDTUW

May, 2016: Pradyumn Nand's blogs his experience with us! "Precog Diaries - A Roller Coaster Ride"

May, 2016: You can enroll for the online course Privacy and Security in Online Social Media (PSOSM) on NPTEL now. Help spread!

May, 2016: Sonal Goel blogs her experience with us! "Funfilled and Rich Experience @ Precog"

May, 2016: Our tool on analyzing your Facebook profile goes live! Try it out, you will be surprised to see some of the results!

May, 2016: Srishti Gupta will speaking  at the Messaging Malware Mobile Anti-Abuse Working Group on "App SPAM: An Evolving Threat?"

May, 2016: Shrey Bagroy is interning at Georgia Tech for this Summer 2016!

May, 2016: Megha presented the paper Demographics and Sociability in Online Interactions | Slides | Picture.

May, 2016: We are looking for full time Research Associates and Developers to work with us. Please apply with your CV.

Apr, 2016: Pradyumn successfully defends his Masters Thesis.

Apr, 2016: Paridhi Jain successfully defended her Ph. D. thesis. Slides | Picture.

Apr, 2016: Sonal Goel successfully defended her Masters Thesis. Thesis | Slides | Picture.

Apr, 2016: Precog's second Ph. D. Thesis Defense: Paridhi Jain.

Apr, 2016: Masters Thesis Defense: Sonal Goel.

Apr, 2016: Masters Thesis Defense: Pradyumn Nand.

Apr, 2016: PK will be offering the Privacy and Security in Online Social Media (PSOSM) course on NPTEL. Registrations start in May. Teaser video | Flier.

Apr, 2016: PK will be speaking at TEDx Juhu.

Apr, 2016: Precogs deliver tutorial at OSM Hackathon organized as part of Innerve 2016 at IGDTUW. Picture 1, Picture 2.

Feb, 2016: Our paper "Emotions, Demographics and Sociability in Online Interactions" accepted at ICWSM 2016. Authors: Kristina Lerman, Megha Arora, Luciano Heitor Gallegos Marin, Ponnurangam Kumaraguru and David Garcia.

Feb, 2016: Precog is organizing OSMpalooza: An Online Social Media Hackathon

Dec, 2015: Niharika gives a talk on "Privacy in India: Attitudes and Awareness" at Jaypee Institute of Information Technology (JIIT).

Dec, 2015: Our paper "Online Social Media - New face of policing? A Survey Exploring Perceptions, Behavior, Challenges for Police Field Officers and Residents" gets accepted at 18th International Conference on Human-Computer Interaction. Authors: Niharika, PK.

Dec, 2015: Our paper "On the Dynamics of Username Changing Behavior on Twitter" gets accepted at 3rd IKDD Conference on Data Science, 2016. Authors: Paridhi, PK.

Nov, 2015: Our portal on analysing Facebook pages & Twitter handles of various police organisations in the country.

Nov, 2015: Facebook pages & Twitter handles of various police organisations in the country.

Nov, 2015: IIIT-Delhi is now part of Information Security Education & Awareness Phase II project. The total worth of the project is 96.08 Crore Rupees (approx. 14.7 million USD). IIITD is one among 40 other institutes in the project. PK is the Chief-Investigator for the project at IIIT Delhi. Project duration is for 5 years.

Oct, 2015: Our workshop on Masters' Trainer program for Staying Safe Online captured in IIITD's Newsletter.

Oct, 2015: 51 school teachers from Delhi NCR attended our "Master Trainers' Program. Staying Safe Online for School Teachers." Report on CBSE website

Oct, 2015: Niharika's work on Facebook & Twitter handles of police organizations in India gets cited and discussed in Economic Times, page 10, Oct 2. Niharika is also quoted in the article.

Oct, 2015: Five new blog entries! Rohan (Un été français enrichissante (An enriching French summer), Megha (I have been Precog-ed: Part 2), Manik (My experience interning at Precog), Pradyumn (Memoirs from South Asia Workshop 2015 at NUS School of Computing), and Ashwin (It’s been about three years since my time at Precog) pen their experiences at Precog.

Oct, 2015: Anupama receives COSN travel grant.

Sep, 2015: Niharika Sachdeva presented her paper "Online Social Networks and Police in India - Understanding the Perceptions, Behavior, Challenges" at ECSCW 2015.

Sep, 2015: Paridhi presented her paper "Other Times, Other Values: Leveraging Attribute History to Link User Profiles across Online Social Networks" at Hypertext 2015. Picture.

Sep, 2015: PK gave his 8th ACM India Eminent Speaker talk at ITM, Gurgaon.

Sep, 2015: Mr. Vijay Gopal, Assistant Professor, St. Peters Engineering College, Hyderabad, visiting us for a week.

Sep, 2015: PK receives Teaching recognition from IIITD. This recognition is for CSE501 Designing Human Centered Systems that he taught Winter 2015 semester based on the feedback given by students from the course.

Sep, 2015: Pradyumn (our M.Tech. student) gave a talk "Journey of a volunteer to R.E. Merwin Scholarship" at IEEE Delhi Student - Young Professionals - Women In Engineering Congress 2015.

Aug, 2015: Our browser plug-in Facebook Inspector (FbI) crosses 100 downloads on Firefox within 2 weeks of launch. Chrome version launched today. Downloads: Firefox | Chrome

July, 2015: Anupama's paper "What They Do in Shadows: Twitter Underground Follower Market" gets Best Student Paper award at 13th International conference on Privacy, Security, and Trust, Istanbul, Turkey.

July, 2015: PK quoted in National edition of LiveMint! "Stay safe online", July 22.

July, 2015: Niharika's work quoted in The Times of India. "Social media is used to take feedback from people and channelize police resources accordingly, be it for traffic management or crime prevention. A research on how the system made police accountable has already won two Delhi researchers an award in the US." Full research paper.

July, 2015: Megha (starting her Senior year in Fall) presented her internship work on Understanding the Impact of Demographics on Sociability. Work done as part of the Viterbi-India Summer Internship Program at Univ. of Southern California. Her mentors at USC were Prof. Kristina Lerman, and Dr. Luciano Gallegos.

July, 2015: PK gets featured on CMU's home page stories.

July, 2015: Aditi's work gets covered in The Telegraph and BBC News.

July, 2015: Aditi Gupta successfully defended her Ph.D. thesis. Designing and Evaluating Techniques to Mitigate Misinformation Spread on Microblogging Web Services. | Slides | Video