How do I clear Safari sites

How do I to clear all sites at Safari under Bookmark and Social? I mean. I'm perssing at Safari followed at bookmark and there is read list and Social. With me under social it's many many websites in a long line I didnt known before. I need to remove all of it, but don't know how to do. I think that it makes my surf very slow. I checked on settings and safari where I cleared history and coockies, but nothing else happened :(