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81.0 percent of the total U.S. Internet audience viewed online video.

Looking inside of those numbers, it’s not surprising that the bulk of content creators are simply social networking users that do things like post photos or links, but there’s also a quickly-growing number of people participating in more involved activities like blogging or uploading their own videos.

As you can see in the above chart, 71 million people created content on social networks last year, while 21 million posted blogs, 15 million uploaded videos, and more than 11 million participated in virtual worlds. Overall, eMarketer arrives at the 82 million number – which counts everyone who generated content at least monthly - by accounting for the overlap within the respective categories measured.

Although the stats on quickanddirtytips.com are fairly impressive—in 2008 more than 20 million Quick and Dirty podcasts were downloaded, and Web traffic was up 125%—the effort for Macmillan is still largely about test-marketing potential books and authors. Richard Rohrer, director of digital business development, said that while he's happy the site is a “financially successful enterprise,” he's more interested in seeing which podcasts and podcasters gain an audience. “The thing about podcasts is that they're a cost-effective way to test a subject area and talent,” he noted.