| API | Description | Category | Date |
|---|---|---|---|
| Twittervision | Location based data for the Twitter service | Messaging | 2007-04-23 |
| Twitvid | Video social network | Video | 2012-06-08 |
| Twitxr | Mobile photo sharing | Photos | 2008-03-01 |
| Twivatar | Twitter avatar service | Photos | 2009-06-17 |
| Twones | Social music service | Music | 2008-12-20 |
| twt.fm | Twitter music sharing service | Music | 2009-06-17 |
| Twtmore | Long tweet utility | Utility | 2011-07-05 |
| Tynt | Internet engagement measurement service | Internet | 2010-11-29 |
| Uberlife | Social location based platform | Social | 2012-03-19 |
| uBoost | Community engagement and motivation service | Social | 2012-05-21 |
| Ukulima.net | Kenyan farmers social network | Food | 2012-10-11 |
| Unified Social | Social media marketing platform | Advertising | 2012-06-26 |
| Unofficial Fitocracy | Social fitness platform | Games | 2012-02-22 |
| Unofficial Turntable.fm | Social music service | Music | 2012-07-13 |
| Unofficial Xbox | Gaming network information sharing service | Social | 2012-08-03 |
| Untappd | Social beer discovery app | Food | 2010-12-21 |
| USA.gov Social Media Registry | Social media account registry | Government | 2012-06-04 |
| UseFunnel | Mobile device form and survey data collection service | Social | 2012-04-05 |
| Userplane | Communication software for online communities | Social | 2006-12-01 |
| Utterz | Community site | Social | 2008-08-02 |





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