Sony have now confirmed that Facebook integration is coming to the PS3 with the next firmware update.
As well as being able to link your trophies, and game download info to your Facebook account there will also be changes to the photo category and your friend list options (ability to change the colour! it will also remove the grey box from around your friends if they're not the currently selected one) So the update is largely minor tweaks.
More info at
C&VG