One misleading video -- which has amassed over 3 million views on TikTok -- purportedly shows Ukrainian armed forces storming the streets of Mariupol.
The video was first posted in 2014 during a crisis involving pro-Russian separatists.
Other popular examples include videos of the so-called "Ghost of Kyiv", which was said to have single-handedly brought down six Russian planes at the beginning of the invasion.
This has since been debunked by fact-checkers, who revealed that the footage actually came from the videogame "Digital Combat Simulator (DCS) World".
NewsGuard also said that "some of the myths in the videos TikTok’s algorithm fed to analysts have previously been identified as Kremlin propaganda".
In response, TikTok said that the experiment did "not mimic standard viewing behaviour".
"While this experiment does not mimic standard viewing behaviour, we continue to respond to the war in Ukraine with increased safety and security resources as we work to remove harmful misinformation and help protect a safe experience on TikTok".
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