If the tag is available in its nonspaced version, the yes. But if the tag is taken, no. As the user above me said, there was a glitch that happened in a period of time that allowed you to make spaced tags of tags that were already available.
yeah you can only make a spaced tag if the unspaced version was untaken , E.x the gamertag S T E R O I D S is not taken but since there is the tag Steroids it cannot be used.