I don't know anything about osqa or libravatar but the recent [stackexchange podcas][1]t suggested that there are planned changes relvant to avatars. This has been [confirmed][2] by [Jeremy Tunnell][3]. It looks like SE plans to host user avatars themselves as well as continuing to support gravatars.


  [1]: http://blog.stackoverflow.com/2012/12/podcast-39-the-one-with-wil-wheaton/
  [2]: https://meta.stackexchange.com/a/161083/147520
  [3]: http://stackexchange.com/users/1635441/jeremy-tunnell