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I don't have a dataplan unfortunately. I use WiFi and HotSpot Browser.
Facebook (Mobile version obviously) works fine except that you can't comment on status updates. But you can update your status, write on other peoples' Walls, and Like status updates/Pages with no problem so it's no biggie.
Twitter on the other hand, isn't working properly. Everytime I try to tweet and/or reply, all I get is a "A communication failure has occurred. This server may be busy, please try again later. If the problem persists contact your service provider."
In addition I can't Re-tweet and my @Mentions and Fav'd tweets don't show up. It's pretty annoying...But I love my Blackberry! =D