Location information removed from translation files with msgmerge --no-location to decrease size of files and reduce diff size. Unfortunately there does not appear to be a setting in msgmerge or msgattrib to remove the extracted comments ("#.") from translation files. If you do know of such a switch, please let me know!
Default settings list Twitter, Facebook, and Identi.ca as targets.
Using icons built-in, and no magic offsite JS or anything so it won't slow down or break if third-party site goes down.
Default styles are a little limited, but can be customized in theme should one be so inclined.
