2. A profile graveyard for entry level corporate kids who do not want to share their Facebook profile with their superiors.
3. A place where salesmen and MLM marketers pump their wares until they realize no-one ever returns or uses LinkedIn.
Jane: "I'm ok, still looking for a job."
Bob: "You should go on LinkedIn, it's like a Facebook for professionals."
Jane: "Thanks, I'll check it out. My kids keep talking about social media."
LinkedIn is also a frequently used sock puppet for identity thieves. Never accept connections from people you don't know. Never put your real physical address into the contact section; give an e-mail address and an unlisted telephone number.
LinkedIn is also a tool that many recruiters (scalpers/headhunters) use in a dishonest manner. Their attempts to connect with you are phishing expeditions to get your connection list. The job that they claim to have is nearly always fake; it is bait, if you accept their connection you will never hear from them again or they will tell you that the job is filled. Recruiters always hide all their connections so you get...