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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As in the non-LinkedIn world, it should be considered a big deal to ask for a recommendation, and it should be a big deal to be asked to give a recommendation. Don't blanket everyone you are connected to with a request to recommend you. You'll put people who don't know your work well in an awkward position, and the recommendations you do get won't be as meaningful as if you had asked in a more pointed way.