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foursquare

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 friends, upload an unlimited number of photos, post links and videos, and learn more about the people ...

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

About.me lets you quickly build simple and visually elegant splash pages that points visitors to your content from around the web. Get started today.

LinkedIn strengthens and extends your existing network of trusted contacts. LinkedIn is a networking tool that helps you discover inside connections to recommended job candidates, industry experts and business partners.

Academia.edu helps academics follow the latest research.

YouTube is a place to discover, watch, upload and share videos.

Yahoo! Groups offers free mailing lists, photo & file sharing, group calendars and more. Discuss hot topics, share interests, join online communities.

同步你的Instagram照片到人人、豆瓣和饭否，支持iPhone/Android客户端

Find what you want in a library near you with WorldCat, a global catalog of library collections.

Google+ aims to make sharing on the web more like sharing in real life. Check out Circles, Messenger and Hangouts, just a few of the things we've been working on.