I've noticed linking to FB and all that jazz uses some serious data. My girlfriend has hundreds of friends on her FB and friendstream was eating data like no tomorrow. I am a heavy data user when I use my phone and she is less than light on data and she was using twice even thrice the data I was using. Once she took the friendstream widget off her screen and disabled synch with FB and such. Her data usage fell to a trickle.
In reality she used maybe 200 MB of data through her own usage. Downloading an app or game. She doesn't browse the net or anything like that and doesn't use tikl or qik or any other data hungry apps...but her usage for the month was 7gb.
well that took alot of research and then alot of trial and error based on the small info I gathered from these forums, but I was having that problem too... First go to each individual app (facebook, twitter, peep, flickr, etc...) and logout using the settings menu. You will not be able to do this via Friendstream is the problem is like mine as it will force close on you. Then restart your EVO (just a precaution that data was effectively logged out) then enter settings, applications and manage applications - enter each app here including friendstream, twitter, facebook & facebook for HTC, peep and any additional apps you may have that use these log in or sync these accounts and delete your cache and delete data from all these apps. DO NOT WORRY! there are no real important settings here that won't sync when you relog in to your facebook, twitter, etc. Then restart your phone (again a precaution to make sure the data is clear and out of the way.) Now ONE LAST THING - under your full applications menu go to the "Setup" icon of the little magic hat and skip through this process, each page has a skip option and should be all set up on your phone anyway so skip skip skip - what you are looking for is after your email menu where it sets up your facebook and twitter accounts. If there are any green checkmarks click these and say yes to log out of these applications. Now restart your friendstream and it should tell you that you are not logged into any of your social networks. Tap the screen and relog into your twitter, facebook, flickr and if you are as lucky as I was - a few seconds later your are all back life.