Elon Musk tweeted Mark Zuckerberg saying he was 'up for a cage fight' with him.
Zuckerberg took a screenshot of Musk's tweet and replied 'send me the location' Conversations continue between Elon Musk, Mark Zuckerberg, and Dana White ... and while the billionaires are itchin' to get their hands on one another, there's is an issue preventing the fight from being made official -- Elon's weight advantage.
Our sources tell us the guys are still serious about fighting in an Octagon, and as the UFC president told us yesterday, he's absolutely down to put on the fight ... but, Zuckerberg's size disadvantage has become an issue.