Yep, I've done the "check this person's social media over just in case" thing with a couple of folks now. One guy, I browsed through his pictures for about 20 minutes before realizing he was wearing that hat in all his pictures because he's completely bald on top.
As for video footage, I think the ATM footage must be extremely low frame rate and probably looks more like a series of stills than a video you could get a good sense of his walk from. No idea about the stairwell video. Still, more images could only help get a better idea of what he looked like. My hope is that there is some logic i am missing behind police not releasing it right now.