These are some more tools of web 2.0

Wikipedia

Wikipedia is an encyclopedia. It is a multilingual encyclopedia, which means that people can have access to it in his own native languages. It also ranks 2nd

Disadvantages
Anyone can edit it, therefore, sometimes the information cannot be reliable, therefore teacher and professors do not recommend Wikipedia.

Advantages.
More sources means the information can be accurate.
Quick and easy to find the desired information.
Great for finding facts and general knowledge.
Information is clearly explained and also very well distributed.

Social impact
Wikipedia help the users to find a variety of facts and history. It help children in their education, therefore it increases their general knowledge.


MySpace

It is also a social networking place, just like Facebook. It provides users with blogs, personal profile, photos, music, and videos for teenager and adults internationally. MySpace was the most popular social networking website in United States in June 2006.

Advantages
You can find your old friends on MySpace.
You can also communicates.

Disadvantages
People spend hours socializing

Social impact.
It does effect the once social life. As this is a social networking site. Therefore children which are amazed by this spend a lot of time on these site. This affects their education also.