+1 to Titanium Back Up to uninstall system apps...it works marvelous!!
I also use a startup cleaner...that basically restricts what apps/process is allowed to start up on its own.
As for FB...you should be able to turn the updating to manual. OR you can just NOT link your facebook acc't to your phone.
if you are talking about battery life...there are several apps that can help...and its all over these forums. Juicedefender, tasker are two that comes to mind.
Flashing a custom kernal that allows for overclock and undervolt...I think is the way to go to extend the life on a single charge.
Most if not ALL of the custom ROMs that are out there are optimized one way or another to extend battery life (since that seems to be the biggest gripe that most EVO user has)