LinkedIn is not just another social network like Twitter where anything goes. Avoid these "don'ts" and avoid becoming a LinkedIn pariah.
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With just a click of a button, you can endorse the skills and expertise of people you are connected to on LinkedIn. But that doesn't mean you should. Have you actually experienced this person's skills and expertise first-hand? For that matter, have you actually ever met the person whose skills and expertise you are endorsing? Do you expect something in return? If you answer no, no and yes to these questions, an endorsement will do you more harm than good.