Marketing The 5 most-popular stories on PR Daily this week Plus, the most popular story of the summer. By PR Daily staffSept. 2, 2011 SHARE Ragan Insider Premium Content Study: LinkedIn top social media site for journalists 10 reasons PR is a tough job Groupon’s PR chief quits—and offers an important lesson for other PR pros To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.