Many operating systems and frameworks contain built-in trust for one or more existing CAs (such as VeriSign/Symantec, DigiCert, TC TrustCenter, Comodo, GoDaddy, GlobalSign and StartCom).
Companies and organizations such as Barclaycard, GoDaddy, American Greetings, Groupon, Hertz, Ogilvy, Sephora, Tesco, University of Phoenix, Tupperware, Waitrose, and JackThreads use Conversocial's Software as a Service to manage the flow of customer service enquiries and discussions on Facebook and Twitter.