KnowEm (www.knowem.com) is a site that allows you to put in a brand name and see if the equivalent username is registered on more than 100 social media websites. Just because you don’t know about or have never used some of these sites doesn’t mean you cannot register a username (if available) and at least keep others from getting a hold it.
If you find that a username is registered and being used to violate your trademark, consult an attorney and review the site’s policies for resolving disputes involving trademarks and usernames.
