Here are a few: menewsha.com
roliana.com
Whatever your interests or hobbies are, go to Google.com and in the search box type "my interests are ____" and you will find some interesting and cool websites. Everyone has different interests and even websites on the same subjects, you make like one and not the other.
Twitter,MySpace,Well those are the most popular.
Secret Builders has cool games and quests! There are many websites similar to secret builders!
gracieandranda.webs.com
bungie.net?
tracpeople.moonfruit.com tycanyon.moonfruit.com
KandeCorn.Piczo.Com
Coolmath.net
There are many "Cool" virtual game sites.
didgi draw on crayola.com
http://www.teenchat.com/
Daily booth