Why does theVerge use so many trackers?

I'm on Windows 7, using Firefox with Ghostery add-on and noticed that theVerge has 10-12 trackers running at any time. They include: Chartbeat, Datran, Facebook Social Plugins, Google +1, Google Analytic, Lotame, PointRoll, Quantcast, ScoreCard Research Beacon, Twitter Button.

I'm not saying these are all bad or malicious by any means as some of them are fairly obvious about their use, e.g. Twitter button. But what about the others?