You only need a placeholder if you think the platform matters enough to hold space for. For example: they don't have a placeholder on MySpace.
But if your goal is to prevent other people from having the name altogether, the move I personally enjoyed engaging in was getting my account blocked. That forces them to hold your account only to prevent anyone from using it, lest you might sneak back in and say something "harmful" like "stonetoss is hans kristian graebener".
But if your goal is to prevent other people from having the name altogether, the move I personally enjoyed engaging in was getting my account blocked. That forces them to hold your account only to prevent anyone from using it, lest you might sneak back in and say something "harmful" like "stonetoss is hans kristian graebener".