"LinkedIn is a networker’s dream: an easy way to learn about, and reach out to, millions of businesspeople and thousands of employers. Yet many LinkedIn users don’t take advantage of the site’s features even though the vast majority are free.
Here are my top 25 recommendations for getting past “Well, I’ve got a login” and making the site really work for you, whether you’re job hunting, hiring, growing your entrepreneurial business, or just seeing and being seen in the online branding arena.
You’ll start by creating your LinkedIn profile and adding connections. Then you’ll use LinkedIn’s fancier features to do such things as reach out to friends of friends, join a Group or a LinkedIn Answers conversation, or enhance your profile with apps."