The highly-anticipated Mark Zuckerberg vs. Elon Musk fight is all but cooked ... 'cause Dana White says the billionaire brawl is "probably" never going to happen.
The UFC honcho -- who got involved in negotiations after the two tech nerds agreed to take their beef to the cage -- was pessimistic when asked Thursday about whether the potential matchup would actually happen ... pretty much killing all hope of seeing the bout come to fruition.