The easier you make your LinkedIn resume to read, the more likely people are to like it. People skim LinkedIn resumes. So don't try to write down everything.
LinkedIn ranks you based on how much of your profile is complete. LinkedIn ignores you until your profile is 100% complete. You don't show up on searches, and you basically get left out in the cold. This is because LinkedIn does not want to show your profiles.
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Your profile picture should look professional. "Don't stand in your driveway and wear a suit."
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You want your LinkedIn profile picture to be the same on every account.
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Your professional headline: LinkedIn uses this headline as a major part of this search. It automatically puts the title of your last job as your headline. CHANGE IT.