One of the most memorable moments of the entire card was Merab picking up opponent Henry Cejudo and slamming him to the canvas near where Zuck was sitting, before engaging in a conversation with the billionaire.

TMZ Sports asked the 33-year-old contender about Mark's presence.

"We are following each other on Instagram, and he did text me before the fight that he was coming. He told me 'Don't tell no one.' I can keep a secret, of course," Dvalishvili told us, adding, "I knew he was there, and once I was walking out I saw him, of course, I said hello to him in person."

Although Zuck wasn't technically Merab's corner like he (momentarily) was for Alex Volkanovski, that's not to say Mark didn't share some of his BJJ expertise.

"I had a 4th corner that night. [Zuck] was giving me some tips when I was fighting," Merab said with a laugh.

Remember, Zuck has trained with the likes of Volk, Israel Adesanya, Mikey Musumeci and other top fighters.

Dvalishvili also revealed he was supposed to train with Zuckerberg before the FB exec injured his ACL last year. The men plan to get together once MZ's healed up.

Billionaire tech geniuses aside, there's a bunch more with Merab ... who many fans assume will get the next crack at a title after "Suga" Sean O'Malley and Marlon "Chito" Vera fight at UFC 299 next month.

We asked Merab if the UFC has informed him that he will fight the winner. Merab also tells us who he would prefer to fight, and why.

As for his 298 opp, we also asked Dvalishvili if 37-year-old Cejudo should retire after his second straight defeat.