This never happened coding ... Mark Zuckerberg tore his ACL training MMA, and was forced to go under the knife, delaying a real deal fight Zuck had scheduled for early next year!
The Facebook founder shared several photos from his hospital bed Friday afternoon ... announcing he's suffered a serious injury to his left leg.
"Tore my ACL sparring and just got out of surgery to replace it. Grateful for the doctors and team taking care of me. I was training for a competitive MMA fight early next year, but now that's delayed a bit.