StumbleUpon has released a very cool StumbleUpon Facebook app which brings Facebook & StumbleUpon profiles together. By installing the application into your Facebook profile, sites which have received a Thumbs Up by you and others on StumbleUpon will be featured on Facebook profiles.
This also makes identifying different StumbleUpon users much easier, as you may have friends who use SU, and not even know it.
Source:→ SEJ Blog
StubleUpon, Facebook, StumbleUpon Facebook App