The number 25 web 2.0 properties is the most common sites that many web development companies are considering.and
these are the top PR sites.Here am attaching the list..If you find any one apart from it please made post here..Thank you
The list of top web 2.0 properties are
1. http://www.wordpress.com
2. http://www.weebly.com
3. http://www.wetpaint.com
4. http://www.clearblogs.com
5. http://www.squidoo.com
6. http://www.hubpages.com
7. http://www.blogger.com
8. http://www.livejournal.com
9. http://www.vox.com
10. http://www.quizilla.com
11. http://www.weebly.com
12. http://www.blogger.com
13. http://www.43things.com
14. http://www.zimbio.com
15. http://www.topix.com
16. http://www.knol.google.com
17.http://www.Gather.com
18.http://www.Xanga.com
19. http://www.9rules.com
20. http://www.eHow.com
21. http://www.tumblr.com[
22.http://www.wikihow.com/Main-Page
23. http://www.ning.com
24. http://www.360.yahoo.com
25 http://www.squarespace.com
26. http://www.Blog.com