what are some good web 2.0 websites?

please share some good websites which gives back good do follow link to our website

1. Wordpress.com
2. Tumblr.com
3. Blogger.com
4. Jimdo.com
5. Livejournal.com
6. Wix.com
7. Weebly.com
8. Blogspot.com
9. Deviantart.com
10. Goodreads.com
11. Zoho.com
12. Sites.google.com
13. Medium.com
14. Pen.io
15. Angelfire.lycos.com
16. Xing.com
17. Instructables.com
18. Evernote.com
19. Slashdot.org
20. Hubpages.com
21. Webs.com
22. Soup.io
23. Wikidot.com
24. Typepad.com