With more than 85 million members in more than 200 countries, LinkedIn is a professional social network worth using, understanding and optimizing.

After you’ve covered the basics of setting up your LinkedIn presence, features including recommendations, applications, LinkedIn Answers, and the Resume Builder can add value to your profile. Many of these highly useful features, though, are often overlooked or underused by newcomers.

We spoke with four LinkedIn aficionados to get their top advice on making the best use of these tools. Read on for their thoughts and let us know which tips you’d add for optimizing LinkedIn profiles in the comments below.

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