Shares in Alphabet (:GOOGL.O) closed up 0.7 percent, while those in Apple Inc (:AAPL.O) fell 0.3 percent and Netflix Inc (:NFLX.O) closed barely higher. He lost $16.8 billion in extended trading. The CEO's own fortune lost $15.4 billion (€13.2 billion) of its value.
But amid every controversy, Facebook - the public company and business - seemed unscathed.
The company issued a warning to investors about a deceleration of growth in its userbase, leading to a stock drop of around 20 percent.
Some blame the Cambridge Analytica scandal - that political data company that gained access to 50 million users' information, resulting in Zuckerberg testifying before Congress. Facebook attributed the weaker outlook to unfavorable currency conditions, investments in new products and bolstered privacy tools that may put the brakes on breakneck revenue growth.
Mobile advertising continued to to show gains, representing 91% of total ad sales, up from 87% in the second quarter of 2017. A decade ago, nearly no one could have imagined that Facebook would have more than 2 billion users, much less that its family of apps - Instagram, WhatsApp and Messenger - would also count members in the billions.
Facebook had 2.23 billion monthly users as of June 30, up 11 percent from a year earlier, but well short of what industry analysts had been expecting.
Three key factors are driving Facebook's expected revenue growth decline, Wehner said. While the online retail giant's revenue was slightly below earning estimates, profit was double expectations, pushing Jeff Bezos's firm ever closer to becoming the first $1 trillion company.
"Facebook was valuable when you could go there and pick and choose the type of content that you wanted to see".
Facebook's financial reports following the Cambridge Analytica scandal was always going to be an eye-opening experience but, after their announcement on Wednesday, Facebook's global market value took an almighty plummet.
In addition, the company expects to invest in products like Stories "that now have lower levels of monetization", while the introduction of new controls for users to limit their data-sharing with Facebook "may have an impact on our revenue growth", the CFO said.
Of 47 analysts covering Facebook, 43 still rate the stock as "buy", two rate it "hold" and only two rate it "sell".
The stock market collapse came after the company warned investors to expect a significant decline in growth rate, and revealed that the number of users in Europe had fallen from 282 million to 279 million.
The big story from the earnings report was the forecast that revenue will decelerate in the second half of 2018, Pivotal Research analyst Brian Wieser wrote in a research note.