SAN FRANCISCO (AP) — Twitter announced Tuesday that it is expanding efforts to protect its users from abuse and harassment, the latest milestone in a broader, growing corporate campaign to crack down on online hate.The social media giant said it has begun identifying people who have been banned for abusive behavior and it will stop them from creating new accounts. The company said its changes, which also include a new “safe search” feature, will be implemented in the coming weeks.In July, Twitter banned conservative provocateur Milo Yiannopoulos, an editor of the right-wing news site Breitbart News, for “participating in or inciting targeted abuse of individuals.” Twitter subsequently suspended the accounts of other prominent figureheads of the “alt-right” fringe movement, an amorphous mix of racism, white nationalism, xenophobia and anti-feminism.Twitter has been under fire for failing to address hate and abuse on the site since its founding a decade ago.