Constant network / internet activity

Once I updated to 10.8 my internet traffic has gone crazy. I have a capped isp- and I have used almost 10gb of internet traffic in 3 days!
In Activity Monitor, with Air Port turned on there is constant internet traffic both upload and download, usually hovering around 2-3 mb every 5 minutes or so (4.6 mb during posting of this topic!).… this has added up to gigs of traffic.
What is this and how can I stop it?
Anyone else having this problem?
Help!

Given signs of constant network activity, you might Reset Network Settings (network only). (Settings/General and scroll all the way down the page.)
You'll have to sign back in to your network once your device has rebooted. In my case, doing the Reset Network Settings thing stopped the constant network activity as reflected in the rolling network activity icon shown in the status bar at the top of the screen.

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    Help
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    [email protected]

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