Just a quick question, Im on prepaid so I ussualy buy 'data packs' of around 200MB, but its expired and I was wondering If I send a tweet, or send some data on Tap Tap Reveng, or any game (e.g high scores), how much data would that use? Or cost? Im on Optus, and was wondering if tweeting every now and then when I DONT have data on my plan will use a load of my credit.