Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with fr...

百度贴吧是结合百度搜索引擎建立的大型中文社区，让那些对同一个话题感兴趣的人们聚集在一起，方便地展开交流和互相帮助。于2003年12月3日上线。

Twitter is without a doubt the best way to share and discover what is happening right now.

Quizlet is a lightning fast way to memorize vocabulary lists. It

Good old Wikipedia, great new look

Foursquare helps you and your friends find great places and make the most of your visits. Get personalized recommendations, search for what you’re cr...