Mostly it's a reverse job-board: "Here are my skills, work history, and list of people you may know that are willing to say that I rock; call me if you want to

Mostly it's a reverse job-board: "Here are my skills, work history, and list of people you may know that are willing to say that I rock; call me if you want to hire me." The farther along and more successful you are in your career, the better the offers you get are. It has secondary functions like keeping track of people in your network and some social media aspects (that hardly anyone uses) but that's the primary one.