Namechk is a little clever service that check the most common social platforms and see if your chosen nickname is free or already taken. Seems I’m the only one using mine, all the services that I use came up as registrered. Don’t really know if this is a good thing dthough, because most of us alredy have our nickname. And if it doesn’t fit somewhere we probably have an alternative nick. But if you’re a newcomer then it might be a good idea to check with Namechk before you start the register procedure.