US and European lawmakers have demanded an explanation of how the consulting firm, which worked on US President Donald Trump's election campaign, gained access to the data.
Last year, the House Intelligence Committee spoke with Wylie's former boss Alexander Nix - the chief executive of Cambridge Analytica - by videoconference, as Nix is located in London.
In fact, the entire tech sector took a hit after the announcement, with Google shares down 4%, Amazon down 2.42%, and Apple dropping 2%. Facebook discovered the violation in 2015 and required Cambridge Analytica to delete the data, but didn't tell affected users. "They'd sigh and say, 'You can do this as long as you stop doing it on November 7, '" a former Obama campaign data staffer recalled.
The company neverless summoned an "emergency" meeting with its employees to analyze situation created following filtration of tactics of Cambridge Analytica and to listen to ir concerns.
"The Committtee has repeatedly asked Facebook about how companies acquire and hold on to user data from their site, and in particular about whether data had been taken without their consent", Collins writes in his letter.
Facebook users are demanding answers.
The app settings page on Facebook is the place to manage the apps you've given access to.
"They've got responsibility to make sure that that information is used in an appropriate way, so we want to find out how it was gotten, how it was used, and we want Facebook obviously to be transparent about that", said U.S. Senator John Thune, a Republican representing South Dakota.
"Social media platforms have a responsibility to protect the privacy and personal data of citizens, and to protect the integrity of our electoral system where they operate".
Late Friday, Facebook said Cambridge improperly obtained information from 270,000 people who downloaded an app described as a personality test.
David Vladeck, a former director of the FTC's Bureau of Consumer Protection, said that because the practice of collecting friend data went well beyond Cambridge, "that in itself may be a serious problem, especially given the language of the consent decrees, which differentiates between users and others".
Facebook once appeared to acknowledge that some data collection by developers ran counter to the expectations of Facebook users.
The Committee's summons follows a taxpayer-funded trip to the USA in February where they heard from representatives of Google, YouTube, Facebook, Twitter, CBS News, CNN International and the New Media Alliance.
"I am aware how this looks, but it is simply not the case".
"The Committee's Minority is seeking testimony from the whistleblower about the reported misappropriation of private data, as well as information to determine where the data was stored, how it was used, and whether third parties accessed and exploited the information, including in Russia", Schiff wrote. "It is unconscionable that the FTC allowed this unprecedented disclosure of Americans' personal data to occur", the letter said. Clicking on the link will bring up a list of apps under "logged in with Facebook".
Policy-makers around the world are grappling with the implications following media reports that data collected by Facebook and other social-media companies is being harvested and used to influence elections. Facebook states under part three of its platform policy that developers do not have permission to "transfer any data that you receive from us (including anonymous, aggregate, or derived data) to any ad network, data broker or other advertising or monetisation-related service".
People who bridge different friend networks, for example, can have more influence when they post something, making them prime for targeting.