The plans will not prevent some users and advertisers from dropping Facebook either. Facebook is considering adding an "expiration timer" to messages-a feature available in Facebook's "secret conversations" feature.
"This may take some time", Facebook said in a statement to TechCrunch on Friday about the unsend feature. "We did so in full compliance with our legal obligations to preserve messages". "Mark is really sorry for that, and what we're doing now is taking really firm action".
But Facebook told TechCrunch it has not finalised exactly how the "unsend" feature will work.
The company also raised the idea of a "retention period", though there is no such thing for normal users. However, other unnamed sources have since stepped forward to say that their communications with Zuckerberg have undergone the same type of retraction, with only their own messages still appearing in their message threads.
Facebook says page administrators and advertisers will be verified by being asked to provide a government-issued ID.
"We realise we won't catch every ad that should be labelled, and we encourage anyone who sees an unlabelled political ad to report it. People can do this by tapping the three dots at the top right corner of the ad and selecting Report Ad", it said. It has not specified what number of followers would trigger the requirement.
Moscow has denied the allegations.
The move is meant to clamp down on fake pages and accounts that were used to disrupt the 2016 presidential elections in the US.
For the first time, it has also backed proposed legislation requiring social media sites to disclose the identities of buyers of online political campaign ads. Its own policies say that the company "should publicly make available information about its objective, plans, policies, and operations". "As part of this process, we will also tell people if their information may have been improperly shared with Cambridge Analytica".
The bill's sponsors said they welcomed Facebook's support.
The remarks come amid a Facebook apology tour sparked by the revelation that Cambridge Analytica - a British-based political consultancy that worked for the Donald Trump 2016 presidential campaign - obtained the data of as many as 87 million users of the popular social media platform. Before, users could grant an app permission to get information about events they host or attend, including private events.
Up to 311,000 Australians, or one in 50 Facebook users, may have been affected.
"Facebook confirmed to us that the data of overall up to 2.7 million people in the European Union may have been improperly shared with Cambridge Analytica", spokesman Christian Wigand told reporters.
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