The Facebook app is also a major battery drain. But the real kicker is the privacy violations where they grab your phone's address book to make creepy friend recommendations. I tell everybody to uninstall the app and just use the web app. If you make a shortcut to the web app it will work just as well as the native app without the privacy or battery issues.
You realize that's not true? If you choose to enable the "Contact Sync" (the only time when they are sent your device's contacts), this page is shown: http://static.guim.co.uk/sys-images/Technology/Pix/pictures/... Unlike the Path scandal earlier this year, Facebook has done a consistently reasonable job warning people about what they are doing (as well as having the feature off-by-default and, even if you want to use it, somewhat difficult to access).