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The latest data from Hitwise shows YouTube claiming over 73 percent of the online video market in the United States — a larger share in its home market than even its parent compan, Google, enjoys in search. That figure is up 18 percentage points over March of last year, when YouTube had 55 percent of the market. Problem is, these numbers represent significant growth in viewership, but not growth in advertising sales or revenue, leaving Google on the hook for ever-expanding bandwidth costs.