HEATKEYS

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

SkillPages enables you to get found by anyone anywhere searching for your skill. Demonstrate and share your skills, expertise or talents on SkillPages and find people who have the skills you need and see your trusted connections to them.

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.

Diigo is a powerful research tool and a knowledge-sharing community

System Management Section

Easily find more sites like those you like. Similar Sites helps you find related sites and alternatives based on community recommendations and computer analysis.

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.

Home page for water resources information from the US Geological Survey.

Scientific Literature Digital Library incorporating autonomous citation indexing, awareness and tracking, citation context, related document retrieval, similar document identification, citation graph analysis, and query-sensitive document summaries. ...