There were a couple of videos with Gabby in and he hasn't taken them. I reckon a friend of some of Gabby and a couple of players may have sent the videos to them and they're just attention seeking.
For example, Charisma his brother... Who is to say the videos haven't been sent to him and he's made this account up? Why would Gabby make a twitter account and keep it private without anyone knowing about it? Seems a pretty pointless random thing to do and the character on there goes against the character who people say he is who have met him. Oh and they only post video's when it suits them. Never when someone asks for one (unless its him without his face in)