"We should have done this sooner ... and we're sorry that we did not", the spokesperson said. "We did so in full compliance with our legal obligations to preserve messages", the company said.
The social media giant informed the Indian government on Thursday about the details of compromised accounts in response to a notice over the user data breach and details of the steps Facebook was taking to ensure safety and prevent misuse of personal data, reports IANS.
Trying to explain the discrepancy, a company spokesperson said Zuckerberg and other executives were using an encrypted version of Messenger, which included a "timer" that allowed them to have their messages automatically deleted.
"This story reinforces people's fears about Mark Zuckerberg and Facebook".
UFC star McGregor released on $50K bond amid criminal charges
In wake of the attack , which injured multiple fighters , UFC has reshuffled much of the main card for the pay-per-view event. That bus also contained Ray Borg , who's fight has also been cancelled due to fragments of glass getting in to his eye.
Instagram, who is owned by Facebook, also allows messages to be deleted if the recipient has not viewed it or its ancillary push notification. If a user long presses a private message on Facebook a "Delete Message" pop up confirms that the function will "delete your copy of the message", and the recipients' copy will remain.
By contrast, messages from Mr Zuckerberg that are older than four years old seem to comprise the bulk of those deleted, according to TechCrunch. A spokeswoman later clarified that the data on friends who were not direct users of the app was passed along in adherence with their privacy settings, sharing only public information. "This may take some time", a Facebook spokesman wrote in an e-mail last Friday.
Then, some users who logged in to Facebook through Android devices discovered that Facebook had been collecting information about phone calls they made and text messages they sent.
The British political research organisation, which collaborated with Donald Trump's campaign in the run-up to the 2016 US Presidential election, used the leaked information to develop a computer programme to predict the decisions of US voters and allegedly influence them.
Facebook said on Wednesday that the personal information of up to 87 million users, mostly in the United States, may have been improperly shared with political consultancy Cambridge Analytica, up from a previous news media estimate of more than 50 million.