An HTML5 supported embed for YouTube videos.
http://apiblog.youtube.com/2010/07/new-way-to-embed-youtube-videos.html
Audio / Video Media
Get access to data on 370,443 websites that are YouTube IFrame Embed Customers. We know of 56,196 live websites using YouTube IFrame Embed and an additional 314,247 sites that used YouTube IFrame Embed historically and 44,077 websites in the United States.
Get a list of 370,443 websites using YouTube IFrame Embed which includes location information, hosting data, contact details, 56,196 currently live websites and an additional 32,565 domains that redirect to sites in this list. 314,247 sites that used this technology previouslyand 44,077 websites in the United States currently using YouTube IFrame Embed.
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