The Internet Research Agency, the Kremlin-linked troll farm that has used Facebook and other social media in an attempt to meddle in USA politics, created Pages meant to look like they were run by real American activists.
Zuckerberg, in his Facebook post said, "These steps by themselves won't stop all people trying to game the system".
Facebook disclosed in September that Russians under fake names had used the social network to try to influence US voters in the months before and after the 2016 election, writing about inflammatory subjects, setting up events and buying ads.
A separate Facebook post said examples may include "pro-life/pro-choice", Second Amendment ads or ads that express "support for public infrastructure, like new roads".
The company plans to vet anyone who wants to show the ads, Zuckerberg said, and users will now see on-screen indicators that what they are seeing is a "Political Ad" and just who is funding it.
Facebook has confirmed that the data of 2.7 million European Union citizens were among those improperly used by political consultancy Cambridge Analytica, the European Union executive said on 6 April.
In addition, the 87 million users who might have had their data shared with Cambridge Analytica will get a more detailed message informing them of this.
The move seems geared at preventing election interference. The "unsend" message feature will allow users to recall messages, something that they can't do right now.
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They always like to say, 'Oh that's a conspiracy theory.' It's not a conspiracy theory. "Oh yes, oh yes, a lot of people die". After speaking for nineteen and a half minutes, Trump said, "This was going to be my remarks - two minutes, right?"
The company admitted it began erasing the messages of Mr Zuckerberg and a few other top executives in 2014 after computer hackers obtained and released emails from Sony Pictures executives. I didn't really have any reason to doubt their sincerity.
"We suspect that looking back a year from now, if not sooner, this episode will have been a uniquely compelling buying opportunity in the mega-cap internet space", Deutsche Bank analysts said. After all, Facebook does not sell its service to users; it sells users (technically access to users) to advertisers.
Cambridge Analytica was employed by Donald Trump's presidential campaign. "There are operational things that we need to change in this company and we are changing them".
The ICO has been reviewing the use of data analytics for political purposes since May 2017 and is now investigating 30 organisations, including Facebook, Denham said earlier this month.
I have asked Congressperson Barbara Lee to involve the congressional Black Caucus to get their legislative colleagues to demand that Zuckerberg, while testifying in Washington next Monday, commit to a year-long series of full-page ads in each of our 200 (+) Black newspapers apologizing to Black American citizens who have utilized Facebook in greater percentages than any other ethnic group.
Facebook is also investing in Artificial Intelligence (AI) and adding more people to help find advertisers that should have gone through the authorisation process but did not.
"We know we were slow to pick-up foreign interference in the 2016 United States elections".
"We believe most people on Facebook could have had their public profile scraped in this way", he said.