The Securities Exchange Commission last month made official what investor relations professionals had known and practiced for some time now: SM is OK for IR if you remember Reg FD.
Regulation FD, “fair disclosure,” has existed since before the dawn of social media, and requires coordinated statements by publicly traded companies. It was originally issued in 2000 as part of a set of regulations designed to prevent selective disclosures and insider trading.
In April 2013, the SEC issued guidance approving the use of social media platforms for communications with investors, provided that companies first alert investors about which social media channels will be used, and otherwise comply with the coordinated statements requirements of Regulation FD
http://www.sec.gov/news/digest/2013/dig040213.htm