Hulu jumped two spots to become the fourth largest video site in the U.S. in February, according to the latest data from comScore VideoMetrix. Hulu drew an audience of 34.7 million people who watched 332.5 million video streams. That is a 42 percent increase in unique U.S. visitors, up from 24.5 million in January, and a 33 percent increase in streams, up from and 250.5 million streams. In a single month, Hulu overtook Viacom and Microsoft in total viewers and video streams (see January data).