I need to update my LinkedIn (haven't done it in several months and have since changed jobs and a few other things). I like it because I get news updates, can follow people in my industry or just people that I think are interesting, get business ideas, look for jobs, post jobs, etc. I think it's quite a powerful tool if you use it correctly. There's no point in having it if you think it's another facebook and just wanna talk to all your friends, but it's very good to have if you want to connect with those friends and through them meet a potential employer or get new business ideas.