All that publicity for MySpace and Facebook apparently doesn't mean squat. MediaPost reports that the U.S. trails emerging markets such as China, Brazil and Russia in the adoption of activities including blogging, social networking and video-sharing. Some stats quoted from the article:

- China has already surpassed the U.S. in the number of people starting their own blogs, at 43 million compared to 26.4 million.

- Online social network membership in countries such as Brazil, Russia, Taiwan and Mexico is growing at more than 70% compared to less than 49% in the U.S.

- The U.S. remains a dynamic market for social media. Among the fastest-growing categories since the start of 2008 are watching online video (more than 70% have done so at least once), downloading a podcast (30%), and subscribing to an RSS feed (almost 20%).

"We tend to think of ourselves (in the U.S.) as leaders, but we're just catching up with the rest of the world," said Graeme Hutton, senior vice president and director of consumer insights at Universal McCann, in a presentation Wednesday at the Advertising Research Foundation's Re:think 2008 conference in New York, according to the report.