is it really just about online social networking?

all this talk about web2.0, no one can really say definitively what it is about one thing or another. Here's an attempt to break it down to brands:

Digg community-based popularity website, it combines social bookmarking, blogging, and syndication with a form of non-hierarchical, democratic editorial control. In essence, viewer's choice.

del.icio.us (is a social bookmarking web service for storing, sharing, and discovering web bookmarks. It's owned by Yahoo. A non-hierarchical keyword categorization system is used on del.icio.us where users can tag each of their bookmarks with a number of freely chosen keywords (cf. folksonomy). Its collective nature makes it possible to view bookmarks added by similar-minded users.

del.icio.us has a "hotlist" on its home page and "popular" and "recent" pages, which help to surface interesting content and make the website an effective conveyor of popular internet memes and trends.

Del.icio.us stands for Bookmarking, Sharing and Discovery while Digg stands for Buzz, Partying and Traffic.

Technorati is an Internet search engine for searching blogs. Technorati includes a public developer's wiki, where developers and contributors collaborate, as well as various open APIs.

MySpace is a popular social networking website offering an interactive, user-submitted network of friends, personal profiles, blogs, groups, photos, music and videos internationally. The service has gradually gained more popularity than similar websites to achieve nearly 80% of visits to online social networking websites.

Facebook is a social networking website.
Facebook was originally restricted to members with a college or university email address, but has since been made available to any email address.

Flickr is a photo sharing website and web services suite, and an online community platform, which is generally considered an early example of a Web 2.0 application. The service is widely used by bloggers as a photo repository. Its popularity has been fueled by its innovative online community tools that allow photos to be tagged and browsed by folksonomic means.

A folksonomy is a user-generated taxonomy used to categorize and retrieve web content such as Web pages, photographs and Web links, using open-ended labels called tags.