Washington, D.C., April 2, 2013 — The Securities and Exchange Commission today issued a report that makes clear that companies can use social media outlets like Facebook and Twitter to announce key information in compliance with Regulation Fair Disclosure (Regulation FD) so long as investors have been alerted about which social media will be used to disseminate such information. (emphasis mine)
They make that very clear in all PR's and the Twitter is linked to their corporate site meeting the criteria.