He has previously testified before US Congress but has resisted repeated requests to do the same overseas.
It's making another attempt, this time in tandem with its Canadian counterpart, to get the elusive Zuckerberg to attend a committee session on 27 November in the Houses of Parliament in London.
Then there's hate speech, hacks and a massive privacy scandal in which Facebook exposed the data of up to 87 million users to a data mining firm, along with resulting moves toward government regulation of social media.
As Facebook user growth has tapered off, its ad sales had continued to surge as it found ways to better target ads to draw clicks and views.
Facebook's quarterly revenue and user growth disappointed investors amid a challenging year for a company navigating data misuse, misinformation and election meddling on its platform.
Zuckerberg has yet to decline. "One of the concerns a lot of people have is whether it's just too big". Global user numbers for Facebook are still rising, but at a much slower pace than Wall Street is used to (or cares for).
The company continues to grapple with privacy issues in the aftermath of the Cambridge Analytica scandal and the proliferation of disinformation.
About 2.6 billion users interact with at least one of Facebook's services each month, up from 2.5 billion when it released the figure for the first time last quarter to emphasise that its potential audience for advertisers is unrivalled in size. Monthly active users, meanwhile, were up to 2.27 billion-a ten percent jump compared to a year ago. Monthly active users totaled 2.27 billion, up 10% from a year earlier.
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Big winners on Wall Street in recent years, Internet giants including Facebook, Amazon.com and Google parent Alphabet have suffered a battering over the last month.
We're seeing video grow dramatically across the ecosystem.
However, Zuckerberg acknowledged that ads in Stories don't make Facebook as much money as ads in News Feed, and revenue growth may be "slower" during the transition period, which he compared to the shift to mobile from desktop.
Morgan Stanley analysts also mentioned the short-term monetization headwinds of moving towards Stories, messaging, video, and Instagram Explore, which are all lower-monetizing interactions. "We will never be flawless, but I'm proud of the work we're doing here", he said. "Stories monetizing at an estimated approximate 30 percent lower rate than News Feed, messaging/video monetization still de minimis and Instagram Explore still without any ads", wrote Morgan Stanley. "We would have thought that this responsibility is something that you would want to take up". It wasn't as fast.
I expect 2019 to be another year of significant investment...
"The upcoming elections will be a real test of the protections we've put in place", Zuckerberg said.
"This is a journey that's going to take years, not quarters", Wehner said in the call with investors. "It will end up being a large part of our business as well".