After Facebook the top social media site is Twitter, and it's also an important destination or advertisers.

Meet Josh Dreller, VP of media technology and analytics at Fuor Digital in Chicago.

In this webinar, titled "How to plan and buy Twitter: A practical guide," Josh explains the phenomenon of Twitter and the advertising opportunities it offers.

The webinar runs an hour, including a question and answer period.

Click here to listen to the webinar.