The top 250 internet retailers have almost universally adopted Facebook and Twitter as marketing channels, while almost as many are on Pinterest as Google+, says Campalyst in a May 2012 infographic. Basing its analysis on Internet Retailer’s Top 500 Internet Retailers 2011 list, and collecting the data from April 14 to May 2, 2012, Campalyst reveals that 97% of the top 250 internet retailers have at least one branded page or channel on Facebook, with Twitter (96%) closely following, and YouTube (90%) also seeing high adoption. Similar to a recent Simply Measured report which found 64% of the Interbrand top 100 brands to have a presence on Google+, the Campalyst data shows Google+ adoption among the top 250 internet retailers to be at 67%, with Pinterest (61%) not far behind. Looking at average follower size, though, a clear winner emerges. Read the rest at Marketing Charts.