Hello--it seems that you are asking whether you can register the term SOCIAL STAR for use with your marketing company services and you have found a company that uses the same term on a website that appears to offer a social media game. The short answer is you will likely need an IP lawyer to help you determine if the term is available and if it is registrable, should you want to register it as a trademark. "Availablility" and "registrability" are actually two separate questions. Just because...