Much can be done with online data. But did you know that computer wonks once determined that liking a Facebook page about curly fries means you're also intelligent? Really. Computer scientist Jennifer Golbeck explains how this came about, how some applications of the technology are not so benign — and why she thinks we should return the control of information to its rightful owners. TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their lives in 18 minutes (or less). Look for talks on Technology, Entertainment and Design -- plus science, business, global issues, the arts and much more. Find closed captions and translated subtitles in many languages at www.ted.com/translate Follow TED news on Twitter: www.twitter.com/tednews Like TED on Facebook: www.facebook.com/TED Subscribe to our channel: www.youtube.com/user/TEDtalksDirector