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Most of the nearly half a billion users of online social networks continue to use Web 1.0 sites.

Many sites are hard to categorize strictly as Web1 or Web2.

For example, launched in the mid–1990s and has gradually added features over time.

The principal content (product descriptions) is curated rather than user–created, but much of the value is added by reviews and ratings submitted by users.

Profiles of users do exist, but social features such as friend links, although present, are not widely adopted.

The democratic nature of Web 2.0 is exemplified by creations of large number of niche groups (collections of friends) who can exchange content of any kind (text, audio, video) and tag, comment, and link to both intra–group and extra–group “pages.” A popular innovation in Web 2.0 is “mashups,” which combine or render content in novel forms.

For example, street addresses present in a classified advertisement database are linked with a map Web site to visualize the locations.

Deciding whether a given site is considered Web2 or Web1 can be a difficult proposition.

This is not least because sites are dynamic, rolling out new features or entire redesigns at will, without the active participation of their users.

We identify novel challenges due to the different structures of Web 2.0 sites, richer methods of user interaction, new technologies, and fundamentally different philosophy. Our intended audience consists of technical readers familiar with some of the basic properties of the Web and its measurement, and who seek to understand the new challenges presented by recent shifts in Web technology and philosophy.

Although a significant amount of past work can be reapplied, some critical thinking is needed for the networking community to analyze the challenges of this new and rapidly evolving environment. At the outset we need to distinguish between the concepts of Web 2.0 and social networks.

Beyond Web 2.0 “ Web 2.0” captures a combination of innovations on the Web in recent years.