CALIFORNIA:- Facebook has apologised for removing several videos posted to its platform by a US right-wing non-profit group. Prager University had said some of the clips had been falsely accused of containing hate speech. The conservative organisation specialises in publishing short lectures and discussions, but is not an accredited academic body. Facebook said it had made a mistake, but PragerU claimed the “deliberate” act should concern every American. The Los Angeles-based institution has previously clashed with Google. Last year, it sued the firm for placing age restrictions on some of its YouTube clips - a move it described as being an “attack” on conservative ideas.–BBC