The use of Twitter among the nation's largest corporations has nearly doubled: 60% of companies listed on the 2010 Fortune 500 have a corporate Twitter account with at least one tweet issued in the previous 30 days, up from 35% who did so a year earlier, according to research from the University of Massachusetts at Dartmouth. Meanwhile, 56% of Fortune 500 companies have a Facebook profile.

Among the 298 Fortune 500 (F500) companies that have a Twitter account, specialty retailers rank highest in Twitter adoption (23), followed by food, drug, and consumer products companies (22), and insurance companies (20). Below, a partial list of industries with the greatest Twitter presence:

Among the 10 highest ranked F500 companies, nine use Twitter—and consistently post to their Twitter accounts. They are Wal-Mart Stores, Exxon Mobile, Chevron, General Electric, Bank of America, ConocoPhillips, AT&T, Ford, and Hewlett-Packard.

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