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Facebook co-founder and CEO Mark Zuckerberg made a surprise appearance on Facebook Live on Tuesday, opening himself up to random user questions covering a wide range of topics.

However, just when the nearly 100,000 live viewers thought the impromptu video chat was just going to be a geek-out session with Zuck, comedian Jerry Seinfeld joined the session, dressed in his familiar white dress shirt, jeans and blazer.

SEE ALSO:Mark Zuckerberg's Twitter and Pinterest accounts hacked, possibly due to an awfully weak password

But before Seinfeld joined the fray, Zuckerberg answered questions covering everything from artificial intelligence to virtual reality and the Oculus Rift. Yet the most surprising thing is that Zuckerberg didn't present any new product. Nope, this was, apparently, just his way of trying to open himself up while simultaneously promoting the powers of Facebook Live as a video platform.

Although, one odd user question that came up in the live chat was the notion that users might one day have to pay to use Facebook. Zuckerberg shot the rumor down and said the site will never charge a fee.

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Later, with Seinfeld sitting just half a foot away from Zuckerberg, so that both could fit in the frame, the conversation quickly veered into the personal. The mostly retired Seinfeld talked about his passion project, Comedians In Cars Getting Coffee, and Zuckerberg revealed his obsession with running (and having run 365 miles overall), building an A.I. that controls his home and his intention on competing in a triathlon. 

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Speaking of fitness, Zuckerberg also said that, even though he isn't currently wearing a cast, he broke his arm last week while riding his bike. 

Seinfeld, who was at Facebook to participate in a separate Oculus Rift project, also took a few questions, which you can watch now. 

The live viewership topped out at around 100,000 viewers, but as of this writing, the video had more than 5.1 million views, which means Zuckerberg might want to consider making this a regularly scheduled video show, since Facebook users are clearly ready and eager to watch.  

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(责任编辑：知識)