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Facebook long had a knack for navigating privacy controversies related to its collection of user data. But the cost of its missteps finally caught up with the company this week, sending its market value down more than $100 billion Thursday in the largest drop in value in Wall Street history.

Long-simmering privacy concerns, dating to nearly the birth of the company in a Harvard dorm room in 2004, have in recent months taken more concrete form than ever. In May, the European Union imposed a strict new regulatory regime. US officials, meanwhile, have begun scrutinizing Facebook in a multiagency federal investigation related to its handling of a recent scandal that exposed the information of 87 million people.

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Worries about the rising costs of privacy regulations, along with declining growth in users and revenue, played a key role in a major Wall Street sell-off Wednesday night and Thursday, with Facebook’s stock closing down 19 percent, at its lowest level in nearly three months. The steepness of the decline suggests investors are reevaluating the viability of Facebook’s core business — collecting extensive data on users so that they can better target them with advertising — in a world in which public pressure is mounting for stricter privacy protections.

‘‘This is a privacy wake-up call that the markets are delivering to Mark Zuckerberg,’’ said Jeffrey Chester of the Center for Digital Democracy, a privacy advocate.

Facebook’s bad day on Wall Street raises questions about the fate of other big technology firms, such as Twitter and Google, which like Facebook have been grappling with rising privacy concerns and congressional demands to more aggressively combat the flow of disinformation on their platforms.

Twitter saw a sharp decline after The Washington Post reported three weeks ago that the company was suspending fake and suspicious accounts at a record pace and might see a decline in its monthly users. The company is expected to report its second-quarter earnings on Friday.

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But analysts noted that Google’s parent company Alphabet saw shares surge Monday after reporting strong earnings despite the new European regulations and a recent $5.1 billion fine for antitrust violations, suggesting that investors have specific concerns about Facebook and its recent bout with scandals.

The public mood regarding Facebook also has arguably soured amid the privacy controversies and revelations about the platform’s role in spreading Russian disinformation during the 2016 presidential election. Calls to #DeleteFacebook have spread on Twitter, and some prominent people have announced that they are stepping away from their heavy use of social media.

In terms of measurable impact on Facebook, the new European rules, called GDPR for General Data Protection Regulation, led to a decline of 3 million users on that continent, company officials revealed in an earnings call on Wednesday. Facebook said that the changes would continue to hurt revenues as more people opted out of ad targeting in the months ahead. The company also said that it would lose money because its advertiser partners had also been affected by GDPR and because of other privacy changes to come.

But Facebook, like some other technology companies, has rolled out the user protections worldwide, meaning the consequences for the company are likely to be global. Chief financial officer David Wehner said in an earnings call Wednesday that Facebook’s expectation of declining earnings growth is ‘‘really a combination of kind of how we’re approaching privacy as well as GDPR and the like.’’

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Problems for the company have not been confined to privacy issues. Signs of trouble have been growing for nearly two years, since the aftermath of the 2016 presidential election when Zuckerberg, the chief executive, dismissed the possibility that the rampant spread of phony news reports on the platform affected the vote. He called the notion ‘‘a pretty crazy idea’’ but later apologized for the comment.

What followed was a major public reckoning, rare for high-flying technology companies. Facebook eventually disclosed aggressive Russian manipulation on its platform and had to answer pointed questions about it on Capitol Hill. Then, news reports in March detailed how political consultancy Cambridge Analytica had siphoned away the data of Facebook users for campaign targeting. This prompted another round of questioning on Capitol Hill, this time of Zuckerberg himself.

Facebook’s stock price proved resilient throughout these controversies — aside from a dip after the Cambridge Analytica news — even as Zuckerberg warned that addressing issues such as privacy and disinformation on the platform would involve costs for the company, such as the hiring of tens of thousands of new content reviewers. That three-year winning streak reversed abruptly after Wednesday’s earnings call, which appeared to crystalize several longstanding concerns.

The earnings report suggests broader worries that a company that has grown at a furious pace for years may finally be seeing its growth easing, especially among younger users opting for such social media alternatives as Snapchat or Instagram. That company, along with the globally popular Whats-App messaging service, is owned by Facebook, but neither has been as effective as the parent company at generating advertising revenue.

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Morningstar issued an analysis Thursday afternoon, noting the slowing growth and lowering its estimated value of Facebook stock

Yet it’s the privacy issues and cascade of recent scandals that dominated commentary about Facebook on Thursday, as investors tried to make sense of Facebook’s tumble.

‘‘If Cambridge [Analytica] had never happened, I don’t think the worries would be as pronounced. Cambridge has thrown in a whole host of worries around confidence for users, advertisers, and regulators. It creates a murkier picture,’’ said Daniel Ives, chief strategy officer and head of technology research at GBH Insights.

What remains unclear is whether the push for tougher privacy regulations has peaked or is still building. The fate of Facebook — and many other tech companies — probably depends on the answer to that question.