ComScore has announced its latest rankings of online video sites and Hulu has broken into the top three for the first time ever as of March. ComScore says that US internet users viewed a total of 14.5 billion videos during the month of March, an 11% increase from February.

Google video sites including YouTube held the top spot for the month with 41% of the total US video market. YouTube alone accounted for 99% of all 5.9 billion videos watched on Google properties. Fox Interactive Media was second with 437 million videos watched and Hulu had 380 million videos watched.

After Hulu the rest of the top five web sites included Yahoo! and Microsoft. Online videos could be big business if the companies ever figure out how to monetize the content without scaring off watchers in the process.

Via ComScore