TikTok and Facebook approved advertisements containing blatant US election falsehoods just weeks ahead of the vote, a watchdog investigation revealed Thursday, calling into question the tech platforms' policies to detect harmful disinformation.

Just weeks before the U.S. presidential election, TikTok still approved advertisements that contained election disinformation even though it has a ban on political ads.

Just weeks before the US presidential election, Facebook and TikTok approved ads containing harmful election disinformation. This is despite a similar Global Witness investigation published two years earlier that found failures in their moderation systems.

Just weeks before the U.S. presidential election, TikTok approved advertisements that contained election disinformation even though it has a ban on political ads, according to a report published Thursday by the nonprofit Global Witness.

Less than three weeks before the presidential election, TikTok is still struggling to consistently enforce its long-standing ban on political advertising, a new report finds. In September, researchers from the nonprofit Global Witness tested the political ad moderation systems of three leading social media platforms - TikTok,