"For the ways my work was used to divide people rather than bring us together, I ask forgiveness and I will work to do better," Zuckerberg said in the post.
He did not refer to specific issues in the message, which comes as Facebook and other technology companies are under increased scrutiny amid a U.S. investigation into potential Russian involvement in the 2016 U.S. Presidential election campaign.
Facebook said on Sept. 6 it had found that an operation likely based in Russia spent $100,000 on thousands of U.S. ads promoting divisive social and political messages in a two-year-period through May.
Facebook, the dominant social media network, said 3,000 ads and 470 "inauthentic" accounts and pages spread polarizing views on topics including immigration, race and gay rights.
Facebook has launched an overhaul of how it handles paid political advertisements, after U.S. lawmakers threatened to regulate the worlds largest social network over secretive ads that run during election campaigns.
Probes being conducted by several congressional committees along with the Department of Justice, have clouded U.S. President Donald Trumps tenure since he took office in January and have threatened his agenda, which has yet to secure a major legislative victory.