Xperia Mini/pro :: Facebook App Data Hogger

my phone came with a lot of unwanted junk installed on it. The Facebook app is one of them. I can check Facebook on my browser when I want to. I don't want it to connect all the time. To my amazement I can't control the app at all. Even with everything turned off it uses about 100MB in the background a week, escpecially since the last update of the app! It starts up automatically every so many minutes. My datalimit is 400MB a month. This way the software pushed by Sony is creating large phonebills. That can't be right! The only way to remove that stuff is to root my phone, that's ridicilous! To pre-install software...ok...but I should be able to control what to do with that software, remove it, disable it and stop it from using up my data! I've informed some consumer agencies about this so I'll see what they have to say. This doesn't seem legal to me since I wasn't informed that I can't remove the apps and that they use data without your permission.