This page is no longer up-to-date. Please see my CV for the list of recent talks.

Exploitable Human Factors and Their Implications for Online Security
Dartmouth College, Hanover, NH, May 04, 2018.

Measuring the Insecurity of Mobile Deep Links of Android
The 26th USENIX Security Symposium (USENIX Security), Vancouver, Canada, August 18, 2017.

Identity Abuse in Mobile Social Networks and Email Systems
Institute for Creativity, Arts, and Technology, Virginia Tech, Blacksburg, VA, March 17, 2017.

Sybil Devices in Crowdsourced Mapping Services
Workshop on Data and Algorithmic Transparency (DAT'16), New York City, NY, November 19, 2016.

Human Factors in the Security of Online and Mobile Systems
Virginia Tech CS Graduate Seminar, Blacksburg, VA, September 2, 2016.

"Will Check-in for Badges": Understanding Bias and Misbehavior on Location-based Social Networks
International AAAI Conference on Web and Social Media (ICWSM), Cologne, Germany, May 18, 2016.

Unsupervised Clickstream Clustering For User Behavior Analysis
SIGCHI Conference on Human Factors in Computing Systems (CHI), San Jose, CA, May 9, 2016.

Attacks and Defenses in Large Online Communities
Uber Inc., San Francisco, CA, February 1, 2016;
LinkedIn Inc., Mountain View, CA, December 2, 2015.

Whispers in the Dark: Analysis of an Anonymous Social Network
The 14th Internet Measurement Conference (IMC), Vancouver, BC, Canada, November 5, 2014.

Man vs. Machine: Practical Adversarial Detection of Malicious Crowdsourcing Workers
Microsoft Membership PM R&D Team, Redmond, WA, September 2, 2014;
Microsoft Azure Data Science and Security Team, Redmond, WA, August 27, 2014;
The 23rd USENIX Security Symposium (SEC), San Diego, CA, 2014 August 20, 2014;
UW-MSR Summer Institute, Seattle, WA, July 30, 2014.

You are How You Click: Clickstream Analysis for Sybil Detection
The 22nd USENIX Security Symposium (SEC), Washington, DC, WA, August 15, 2013.

Wisdom in the Social Crowd: an Analysis of Quora
The 22nd International World Wide Web Conference (WWW), Rio de Janeiro, Brazil, May 16, 2013.

Clickstream Models & Sybil Detection
Security Team of Renren Inc., Beijing, China, March 15, 2013.

Social Turing Tests: Crowdsourcing Sybil Detection
The 20th Annual Network & Distributed System Security Symposium (NDSS), San Diego, CA, February 26, 2013.

Fighting Fire With Fire: Crowdsourcing Security Threats and Solutions on the Social Web
AT&T Security Research Center, Middletown, NJ, January 31, 2013.

Crowdsourcing: Opportunity or New Threat?
Major Area Exam (MAE), UCSB, July 12, 2012. (ReadingList)

Serf and Turf: Crowdturfing for Fun and Profit
The 21st International World Wide Web Conference (WWW), Lyon, France, April 21, 2012.