The average time Google+ users spend on the site is declining, according to a comScore report, and fell from 5.1 minutes per month in November 2011 to just 3.3 minutes in January of this year. Still, brands appear to be starting to embrace the social network, the study found. "As marketers start to become more comfortable there, it will be interesting to see whether active brands can bring more active users," according to eMarketer.

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