I didn't really mean complete integration with Facebook, I don't think we need or want avatars all over the place and 'Johnny 5, Machine-man, Judge Dredd, Japanese-robot-walking-upstairs-falls-over & 12 others like this post.'
I think a Share on Facebook link in the Bookmarks area will quite suffice.
I mean who uses Digg, del.icio.us and StumbleUpon' anyway? Could always add Facebook and Twitter into the mix - no side effects.