Facebook accounts for 95% of social networking time on the web in the U.S. according to an analysis of comScore data provided to us by web publisher Ben Elowitz of Wetpaint.

(We would think this holds for mobile, but it’s possible Twitter has more of a hold there than on the desktop.)

Elowitz’s takeaway from the data: “There’s now no question that ‘social’ means ‘Facebook.'” And if you want to be in front of consumers, you have to figure out a way to be in their Facebook news feed.

This is important for Facebook, since it just announced plans to insert ads into users news feeds. If publishers agree with Elowitz, then it could be the big revenue generator Facebook needs to sustain itself for the next ten years.