Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Storify - Create stories using social media. Turn what people post on social media into compelling stories. Collect the best photos, video, tweets and more to publish them as simple, beautiful stories that can be embedded anywhere.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
Listly - Listly is lists made made easy + social + fun! If you like lists, you will love Listly.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
uberflip - Organize and Centralize ALL of your Content in minutes