Ukraine war: Social media companies asked to archive evidence of war crimes

US politicians have written to the bosses of Meta, TikTok, Twitter and YouTube to request that the companies archive content that includes potential evidence of Russian war crimes in Ukraine.

The letters were sent by four senior Democrats who chair powerful committees in the House of Representatives relating to oversight, foreign affairs and national security.

Although the letters are not equivalent to binding legal orders they are backed by considerable political power and come as the platforms face a range of pressures regarding online safety issues.