LinkedIn joined the New York Stock Exchange today with the initial stock price of $45 per share. As of this writing, the price had rocketed beyond $100, exceeding many expectations.

As the social network grows, there are thousands of publishing professionals you should meet inside the community. We’ve compiled a list of 45 LinkedIn groups for authors, publishers, and readers–a handy introduction to the world of LinkedIn. We’ve also collected a list of eBook groups on the network.

If you want to join these groups, follow LinkedIn’s Finding and Joining a Group directions.

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