Match is an online dating conglomerate, with ownership in Tinder, match.com and OkCupid, among others. IAC/InterActiveCorp (IAC), which is the majority owner of Match, was down 12%. In April, Facebook limited the amount of information third-party developers can collect from users without Facebook's express approval within its application programming interfaces. As Facebook's recent scandals have shown, the company tends to underestimate how bad actors can manipulate its service, so people will have to take Zuckerberg's word that the company built the dating service while anticipating how personal data could potentially be leaked.
Facebook also made the surprise announcement that its portable VR headset - Oculus Go - would go on sale in the United States on Tuesday, priced $199 (£146).
But the head of parliament's Digital, Culture, Media and Sport Committee Damian Collins said on Tuesday he still wanted Zuckerberg to appear before lawmakers, ideally by May 24, and listed 39 questions or points which remained unanswered.
Facebook didn't give a launch date but says more information about the dating feature will be shared in the next few months.
In a letter, the chairman of the United Kingdom committee investigating these issues, Damian Collins, said the last person Facebook sent to testify, its chief technology officer, didn't adequately answer its questions.
Equally interesting will be how Match Group responds to Facebook's move.
On Tuesday morning, Facebook also suddenly began offering users an option to flag every post in News Feeds and elsewhere as hate speech.
And you get an Oculus Go, and you get an Oculus Go, and you get an Oculus Go...
But, these new tools-especially a service for dating, in which people can be at their most vulnerable with one another-come at a precarious time for Facebook.
If you clear your history or use the new setting, we'll remove identifying information so a history of the websites and apps you've used won't be associated with your account.