Twitter's head of trust and safety says she has resigned

Twitter's head of trust and safety, Ella Irwin, told Reuters on Thursday that she has resigned from the social media company, which has faced criticism for lax protections against harmful content since billionaire Elon Musk acquired it in October.

Since Musk's acquisition, Twitter has cut costs dramatically and laid off thousands of employees, including many who had worked on efforts to prevent harmful and illegal content, protect election integrity, and surface accurate information on the site.

Musk has promoted a feature called Community Notes, which lets users add context to tweets, as a way to combat misleading information on Twitter.

Twitter's head of trust and safety, Ella Irwin, told Reuters on Thursday that she has resigned from the social media company, which has faced criticism for lax protections against harmful content since billionaire Elon Musk acquired it in October.

Deep in an open coal mine in southern Greece, researchers have discovered the antiquities-rich country's oldest archaeological site, which dates to 700,000 years ago and is associated with modern humans' hominin ancestors.

The find announced Thursday would drag the dawn of Greek archaeology back by as much as a quarter of a million years, although older hominin sites have been discovered elsewhere in Europe.