Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Pocket - When you find something you want to view later, put it in Pocket.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Twitter Bookmarks - Create shortcuts to your favorite users/tweets on Twitter
Always Reading - Queue up articles and schedule when you want to read them.