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.
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.
BibSonomy - BibSonomy is a system for sharing bookmarks and lists of literature (BibTex format).
4chan - 4chan is a simple image-based bulletin board where anyone can post comments and share images.
Tagpacker - A free tool to quickly collect, organize, and share your favorite links.
Folkd - folkd.com - Social Bookmarking - Save your bookmarks and links online and search what your friends like.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community