Google+ background data usage

I love Google+ but what's up with this amount of background data usage? This is enormous! Thanks ICS data usage screen!

Data usage: Total 797MB and G+ used 492MB. I used Google Music and Spotify which both used less but together 100MB. Time period is 3 days.

Any idea what this could be?
Maybe +Natalie Villalobos or +Louis Gray know?

note: Very few photos have been uploaded and no videos
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