I think its the built in Shozu app.
I sent 7 pictures to upload to facebook, then decided I couldnt be bothered and closed Shozu (completely, from task manager). I couldnt figure out why packet data kept connecting, as I *thought* i didnt have any apps open. After a few hours the problem mysteriously went away.
Then when I got home the pictures were on my facebook. They had completed uploading even when the app was completely closed.
Could that be what other people are experiencing?