sign reads dont give up using up arrowTerms like “blogging,” “tweeting” and “liking” are continuing to gain traction in the lexicon of the marketing industry –or so it seems. New research from the University of Massachusetts at Dartmouth shows that the use of blogs, Twitter and Facebook among the Fortune 500 actually leveled off in 2011, and the results have me wondering: Are the nation’s largest companies giving up on social media?