OK so I havnt fully had time to test everything out yet, but there may be an issue with the update for facebook for android. I went onto the market and saw there was an update available, so ofcourse I downloaded it. well my "running time" has now jumped from whats normally around 30% up to 69% which seems like my phone isnt sleeping (maybe a similar issue to whats going on with the GPS bug lexluthor has discovered)
So for anyone downloading the new facebook update, keep a close eye on your battery after you download it.
BTW I changed no settings at all... I only downloaded and installed it.

 

thanks, Commented in there too