A new survey out by the Pew Internet and American Life Project attempts to examine those questions.

ClickZ has an article on the report. Here's an excerpt:

Web 2.0 (define) is characterized by sites "utilizing collective intelligence, providing network-enabled interactive services" and "giving users control over their own data," according to the report. It also says these are not hard fast rules.

Sites embracing such concepts allow users to share their ideas through text, photo, video and audio. The report offers up Photobucket, where users can upload, tag, share and comment on photos, as one example of such a site. Photobucket's traffic has steadily increased, while "1.0" site Kodakgallery has idled.

"We do see that in a period of roughly the past two years, you can see these dramatic shifts where the share of traffic to a 1.0 site remains flat where the share of a 2.0 site starts to surge," said Pew Internet & American Life Project Senior Research Specialist Mary Madden.

But "2.0" is not just about user content; it also signifies a new sort of lingo. While sites like Yahoo's Geocities always enlisted users to put up their own content, it relied on metaphors of place, such as "cities," "neighborhoods" and "homepages," according to the report. Socially-driven sites like MySpace focus on the person, with profiles, blogs, vlogs and the like.

"MySpace comes to mind. It's three years old, but started gaining traction about a year and a half or two years ago," said Bill Tancer, GM of global research at Hitwise. "Two years ago Geocities and MySpace were neck-and-neck. As of August, Myspace has 9 percent of all Internet visits."