Come on guys, there is no need to make theories and speculate a lot about Zuckerberg in Volks corner. It was done mostly for media purpose. Mark wanted to be more close to a sport he is interested in. Dana and UFC got some extra media recognition. If there is a chance to let famous person to be close to action, why not? It only plays good for business. He did not interfere, he did not do anything bad. He just stood and watched. And media posted most attracting attention photo of him. Of course there are million more photos of him, from every angle.

P.s. To bad from any angle he looks the same. The same as Madame Tussauds weird wax figure