If you are not currently using LinkedIn for recruiting and sourcing, you have some catching up to do. LinkedIn is a networking site used by over 14 million + business professionals. This site allows you to market yourself, search and network with former friends and colleagues, post positions, open discussions on hot topics, and of course find and meet new people. The site can be looked at as a passive job seeker network with professionals from a wide range of industries and backgrounds.
The site has both free and pay accounts. A free account will get the job done, but a pay account opens more possibilities for recruiting and sourcing. Pay accounts let you use LinkedIn’s email system called “InMail” and gets you more search results, as well as letting you make more “introductions” to other professionals. See a comparison of the accounts below:

For searching, LinkedIn offers a good bit of options:

The advanced search features are shown here as an example:

For an example of how a profile looks on LinkedIn - check mine out. I’m always open to networking with other professionals and will accept invitations. A video tutorial will be offered on LinkedIn in the next few days.