Akonter social bookmarking site founded in 2011, is a website for saving web pages or favorite URLs public or private, and save multiple favorite websites on one page, it's specialized for business, shopping, marketing and services tags It can be used to attract more target audience.
BibSonomy - BibSonomy is a system for sharing bookmarks and lists of literature (BibTex format).
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
4chan - 4chan is a simple image-based bulletin board where anyone can post comments and share images.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Folkd - folkd.com - Social Bookmarking - Save your bookmarks and links online and search what your friends like.