Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Linkpack - Save, read and share your links
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.
Twitter Bookmarks - Create shortcuts to your favorite users/tweets on Twitter
Pegao | Save your links - Save your links, it's free and social