(Reuters) – Facebook Inc has replaced its Hide All button with the more succinct Unfollow, letting users block all messages and posts from selected friends. The latter alternative severs ties with that person on the social network, without notifying them. The goal of this change is to help people curate their newsfeed and see more of the content that they care about, Facebook said in an email. Facebook began rolling out the Unfollow button and a related change to its users on Monday.