In addition to Securities and Exchange Commission guidance for its regulated practitioners and publicly traded companies, the Financial Industry Regulatory Authority, Inc. (“FINRA”) issued Notice 11-39, its second providing guidance to its regulated members concerning social media practices, with a focus on explaining which communications require pre-approval by a registered principal (more the interactive communications) and which do not (more the static communications/publications).
Regulatory Notice 11-39 is here: http://www.finra.org/web/groups/industry/@ip/@reg/@notice/documents/notices/p124186.pdf