This is apparently growing rapidly: why pay staff to do this when you can get desperate graduates to do it for free?
Want to jump start a social media marketing campaign for your business but don’t have the time or social media savvy in Twitter, Facebook, YouTube, blogs or similar sites? Try this twist on the traditional summer internship – a “Twinternship.” A Twintern is a newly minted term for a summer intern (paid or unpaid) whose job is to Twitter or handle other social media tasks on behalf of your business. For little cost, you could bring on a young adult (recent college or high school grad or current student) who may already be experienced at using a variety of social media.
http://www.business.com/social-media-marketing/twinterns-twist-summer-interns/
Mark Carrigan 