We recently wrote about Clearspring, an online content sharing network, as one of the “10 D.C. Start-Ups You Need to Know About.” Clearspring’s meal ticket, the “AddThis” button that you’ve ...

Social bookmarking mainstay AddThis has rolled out an online marketplace to help online publishers serve more targeted and relevant content to their visitors. Like other companies of its kind that ...

There's a new face at the helm of McLean-based social media and Web analytics firm AddThis. Richard Harris was appointed chief executive last week after joining Add­This earlier this year as chief ...