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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Doing anything too much -- whether it's updating or messaging or liking or whatever -- isn't good, but doing nothing at all might be worse, at least when it comes to your career. On LinkedIn, why wouldn't you keep your profile updated, update your status with relevant news and content, connect with people you have met at conferences, and join and participate in industry-specific groups? When it comes to any social network, one of the biggest no-no's is to do nothing at all.