The tool will be launched in December.
Since then, revelations from multiple investigations into Russia's attempts to influence the US election have led Zuckerberg to change his tune. He will appear before the end of the year on the page help users of the social network.
Facebook, Alphabet Inc's Google and Twitter Inc are facing a backlash after saying Russians used their services to anonymously spread divisive messages among Americans in the run-up to the 2016 USA elections.
The portal will allow users to see the ads, Facebook pages and Instagram accounts created by the infamous Kremlin-linked troll farm Internet Research Agency that they have liked or followed between January 2015 and August 2017. The Russian outfit spread often-false propaganda that promoted Trump's candidacy and opposed Clinton's.
Around 80,000 people and ads were created by fake accounts or those posing at USA citizens.
Facebook "fought for years for blanket exemptions from the [Federal Election Commission] from the political advertising disclosure rule", AP points out.
"That's why, as we have discovered information, we have continually come forward to share it publicly and have provided it to congressional investigators". USA law enforcement believes APT28 is connected with Russian intelligence operations.
The accounts were active during the U.S. Presidential campaign and published a number of politically charged messages. CBS News tested out the network and confirmed its ability to quickly generate likes. It won't work for users who saw posts from the accounts on their feed because a friend liked them or who saw them via paid advertisements.
The Wall Street Journal first reported details of the October 2016 account purge.
Until a year ago, Facebook categorically denied the platform could be used for misinformation campaigns.
Facebook, Twitter and Google were recently grilled by Congress over the role their platforms and technology played in Russian operatives' efforts to influence the election.