The news comes after it emerged that messages from CEO Mark Zuckerberg and other top executives were removed, a feature that is unavailable to regular users.
"We have discussed this feature several times". "These included limiting the retention period for Mark [Zuckerberg's] messages in Messenger. AggregateIQ works in full compliance within all legal and regulatory requirements in all jurisdictions where it operates".
Facebook claims that it will allow users to unsend messages with no time limits on when they were sent.
In response, Facebook revealed to Tech Crunch its plans to launch feature to delete sent messages for Facebook users. "People who manage Pages with large numbers of followers will need to be verified", said Facebook advertising VP Rob Goldman and Facebook pages VP Alex Himel in a joint blog post.
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The Secret Messaging feature does include an expiration timer, but Zuckerberg's messages were removed from normal conversations well after the fact.
"We know that we did not do enough to protect people's data", Sandberg told National Public Radio.
Facebook has been in the news recently after United Kingdom company Cambridge Analytica harvested the data of millions of their users by way of a questionnaire app.
The existing delete function in Messenger removes the message from the sender's inbox, but it remains visible for everyone else. Those ads targeted Facebook users on hot-button subjects including gun rights, gay rights, religion and presidential candidates Trump and Hillary Clinton. The social network has promised to not unsend any more of Zuckerberg's messages until the feature is available for all users.
As to why Facebook "took so long" to address the Cambridge Analytica data breach, which was first reported in 2015, Sandberg told NBC "we thought that the data had been deleted". "We should have done this sooner - and we're sorry that we did not", the spokesperson added.