Level 2 applications. They are different from level 3 because they are operable without an internet connection, but their greatest advantages are realized online. For example, Flickr, a photo sharing database which is improved by the photos that are uploaded by the internet community. Without the internet, Flickr can still be used, but it quickly stagnates if no new photos are uploaded.

Level 1 applications. They are similar to level 2, but gain less in quality by going online. Such sites include Apple iTunes, where you can listen to music offline, but can only purchase new songs by going online. Again, like with level 2 application, the means of updating is dependent on an internet connection.

Finally, Level 0 applications work as well offline as online. These applications are the "least Web 2.0 of all." Some of these applications include MapQuest, which readers do not contribute to, but rather use only for passive reference. Similarly, Yahoo! Local and Google Maps are also level 0

In conclusion, Web 1.0 is now thought of as "The Web as Information Source," whereas Web 2.0 is thought of as "The Web as Networking Platform.". Among the Web 2.0 sites, we find the so called Social Bookmarking sites like Del.icio.us, Stumble Upon, Digg, etc, and the Social Networking sites like MySpace, Facebook, Twitter, Yahoo Answers and more.

As Social Networking sites grow in numbers and visitors, savvy marketers have managed to pick a share of this enormous traffic for their marketing efforts. Marketing in Social Networking sites is rather tricky, therefore, is necessary to learn how to convey targeted traffic for every particular site. This topic will be addressed in another article.

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