General Apps using internet in background (Wifi and 4g)

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http://androidforums.com – Recently I have been noticing that whenever I unlock the phone and go to the homescreen, I look at the WiFi connection icon in the notification bar and it almost always has some activity. I'm not sure which process or app is using all of that data, but it would be nice to know. I don't have any auto-updating widgets, and I only have 1 account syncing (my google account - calenders, contacts, gmail). I tried going into settings -> data usage, but that only seems to show mobile network data, not WiFi. Anyway, I'm trying to figure out if theres a way to see which programs/processess ar (General)