I've written before about why everyone should be on LinkedIn. And I will keep repeating myself until people stop asking me if it's worth their time.
LinkedIn is the go-to resource recruiters and employers use to locate talent.And not that you need another reason, but here's 1 more:It's a great way to stay in contact with former colleagues you don't like enough to Facebook with but who may be useful to you in the future. Speaking of the future, if you're one of those "rebels" who still refuses to join LinkedIn, WAKE UP. There's only a kiddie pool of work out there and the high dive platform is getting more crowded every day.
Having a complete LinkedIn profile (with photos, recommendations, etc.) will help you come up in search more often and give you a shot at being the first into the water.