The US congressional elections posed a fresh test for social media companies, which for years have struggled to balance free expression against amplifying potentially harmful commentary.
company policies enable them to restrict misinformation, enforcement has been spotty, and the recent upheaval at Twitter has put it under particular scrutiny.
The nonpartisan watchdog group Common Cause, which monitors social media for voter suppression efforts, said that Twitter took no action on high-profile posts that the organization flagged on Tuesday as problematic.
The US congressional elections posed a fresh test for social media companies, which for years have struggled to balance free expression against amplifying potentially harmful commentary.
Voices on the right sought on social media on Tuesday to falsely blame Democrats for voting glitches reported in some places.
Common Cause also noted a "big slowdown" in Twitter's response time since Friday, when layoffs gutted many of the company's teams responsible for elevating credible information.
Twitter, which lost many members of its communications team in the layoffs, did not respond to requests for comment.
Before Tuesday, both Musk and Twitter's head of safety and integrity Yoel Roth tweeted that the company would uphold and enforce its election integrity policies through the midterms.
More than 120 advocacy organizations including Common Cause in May urged - without success - social media companies to introduce "circuit breakers" to curtail the rapid spread of misleading election information by popular accounts.
The falsehoods appeared to originate on messaging app Telegram before spreading to more mainstream social media services, according to Common Cause. A Reuters review found examples on Twitter, TikTok and Meta's Facebook.