University of Massachusetts Dartmouth have released its yearly study of Fortune 500 social media adoption. See it here, some notes below covering 2012.

· 28% of the F500 (139 companies) had corporate blogs.

· 90% of those blogs take comments, have RSS feeds and take subscriptions.

· 73% of the F500 (365 companies) have corporate Twitter accounts with a tweet in the past 30-days.

· 66% of the F500 (332 companies) are on Facebook.