Popular with businesses, LinkedIn is becoming the essential tool for professionals.

A business-orientated social networking site which allows professionals to share their knowledge and experiences, ask questions and network with subject experts and likeminded career men and women. There's also a facility to search for jobs on there as well as hunt down old school mates. 

Over 70 million professionals use LinkedIn to exchange information, ideas and opportunities and the number is likely to keep on growing.

Check out LinkedIn!