Last week I downloaded the new Facebook camera app to my iPhone4. Last Friday, June 1 - three days into my new billing cycle - I received a notice from ATT that I had exceeded my data plan. This was without the usual 65% notice that precedes it. A 45-minute conversation with ATT revealed that I had just incurred a 307-megabyte data transfer spike over the course of an hour, but of course they did not know the specifics. I and ATT are at a loss to understand how this could have happened. I rarely stream music or videos and am very careful that when I do so I'm in WiFi. The only thing I have done recently was download this Facebook camera app, so I'm thinking there may be a connection between these two events, and would like to know if anyone else has experienced such a data transfer spike and if they know what prompted it.