And it continued to suffer fallout from investigations into Russian manipulation of the platform during the 2016 US presidential election.
A total of $128 billion was wiped off Facebook's value in just two hours following the second quarter briefing, the first since the Cambridge Analytica scandal and new European Union data rules came into effect.
In North America, the daily user number was flat at 185 million, and in Europe it actually declined by three million people a day.
Until Wednesday, Facebook shares had been at record highs as investors seemed to shrug off fears about data protection and probes into the hijacking of private information by the political consultancy Cambridge Analytica.
What's more, Zuckerberg warned that the company would continue to make investments going forward, not only in safety and security measures to prevent things like the Russian disinformation campaign seen in the 2016 election, but also in new products and services. On a market-capitalisation basis, the company saw $US120 billion ($AU162.6 billion) erased, the biggest in USA stock-market history.
Zuckerberg himself lost more than $15 billion in net worth in one day and is no longer among the top five billionaires in the world, USA Today reported. Its stock was trading at $176.26 late Thursday, down from $217.50 a share before the report was released.
Imran Khan ahead in Pakistan election polls amid rigging complaints
Bhutto - son of slain prime minister Benazir Bhutto - and his PPP could be called upon to form a coalition with any victor . The military, which has ruled Pakistan for almost half of its 71-year history, denies any effort to influence the election.
"GDPR has not had a significant (ad) revenue impact, but we also recognize it wasn't fully rolled out this quarter", said Facebook chief operating officer Sheryl Sandberg on a call with analysts, adding the company recognizes there could be more risk for decreased numbers in the Europe in the future.
In contrast to Facebook, Amazon on Thursday in the United States reported a record profit and forecast plowing past analyst estimates. "As such, we would be aggressive buyers of the stock on weakness this morning". 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. They believe users have woken up to Facebook's growing list of controversies and chose to vote with their "Log Out" buttons.
After having weathered all of the above, declining financial growth and static user growth has finally resulted in a major investor panic.
"Looking beyond 2018, we anticipate that total expense growth will exceed revenue growth in 2019", he said.
It wasn't since the turn of the century almost two decades ago that anything close to such a huge loss was registered in the U.S.
$120 billion being wiped away in a day is shocking when put into perspective: Microsoft lost $77 billion during the dot-com bust, while Intel lost a huge $91 billion in September 2000.