There is nothing specific to social media yet from the regulators. However, there are a few items which could be beneficial.
First, FINRA came out with guidance in 2006 which includes some good best practices:
http://www.finra.org/web/groups/industry/@ip/@reg/@notice/documents/notices/p120779.pdf
In addition, the FDIC released a guide for businesses that have government contracts which also contains several best practices:
http://www.fdic.gov/about/diversity/sbrp/73.ppt
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Adam Witmer, CRCM
All statements are my opinion, not those of my employer, and should not be taken as legal advice.
www.compliancecohort.com