Guess TwitPic disaggres that "Every Site Should Have A Data Portability Policy": http://www.techcrunchit.com/2010/06/23/why-every-site-should....

This episode can backfire on TwitPic a lot if users decide to leave it, and even more if Posterous decides to open source its TwitPic liberation tool to http://dataportability.org/. These were brought up by same guys from Google's data liberation front (http://www.dataliberation.org/), which is actually endorsed by google: http://twitter.com/google/statuses/17271511025