Web 2.0 is very useful sites for SEO and increasing the backlinks. Here I put all the working sites. I recommend all these sites are great and easy to use.
Top 10 Web 2.0 Sites List with High DA & PA
| S. No. | Web 2.0 Sites | PR | DA | PA |
| 1 | http://wordpress.com | 9 | 94 | 88 |
| 2 | http://blogspot.com | 9 | 60 | 67 |
| 3 | http://blogger.com | 9 | 99 | 100 |
| 4 | http://issuu.com | 9 | 94 | 82 |
| 5 | http://xing.com | 9 | 92 | 69 |
| 6 | http://tumblr.com | 8 | 88 | 100 |
| 7 | http://livejournal.com | 8 | 92 | 97 |
| 8 | http://wix.com | 8 | 94 | 86 |
| 9 | http://weebly.com | 8 | 93 | 83 |
| 10 | http://goodreads.com | 8 | 93 | 75 |
Best High PR Web 2.0 Sites List
| Web 2.0 Sites | PR | DA | PA |
| http://wordpress.com | 9 | 94 | 88 |
| http://blogspot.com | 9 | 60 | 67 |
| http://blogger.com | 9 | 99 | 100 |
| http://issuu.com | 9 | 94 | 82 |
| http://xing.com | 9 | 92 | 69 |
| http://tumblr.com | 8 | 88 | 100 |
| http://livejournal.com | 8 | 92 | 97 |
| http://wix.com | 8 | 94 | 86 |
| http://weebly.com | 8 | 93 | 83 |
| http://goodreads.com | 8 | 93 | 75 |
| http://jimdo.com | 8 | 49 | 51 |
| http://academia.edu | 8 | 93 | 69 |
| http://sfgate.com | 8 | 93 | 69 |
| http://salon.com | 8 | 91 | 69 |
| http://last.fm | 8 | 92 | 74 |
| http://myspace.com | 8 | 95 | 81 |
| http://my.opera.com | 8 | 94 | 71 |
| http://storify.com | 8 | 92 | 72 |
| http://merchantcircle.com | 8 | 72 | 60 |
| http://citeulike.org | 8 | 63 | 55 |
| http://friendfeed.com | 8 | 75 | 68 |
| http://posterous.com | 8 | 87 | 87 |
| http://groups.google.com | 7 | 94 | 75 |
| http://blog.fc2.com/ | 7 | 91 | 74 |
| http://deviantart.com | 7 | 67 | 66 |
| http://rediff.com | 7 | 91 | 68 |
| http://evernote.com | 7 | 92 | 77 |
| http://box.com | 7 | 93 | 68 |
| http://zoho.com | 7 | 84 | 65 |
| http://gawker.com | 7 | 88 | 71 |
| http://typepad.com | 7 | 48 | 52 |
| http://slashdot.org | 7 | 91 | 75 |
| http://webs.com | 7 | 51 | 66 |
| http://wikispaces.com | 7 | 43 | 49 |
| http://diigo.com | 7 | 89 | 68 |
| http://tripod.com | 7 | 43 | 48 |
| http://calameo.com | 7 | 92 | 65 |
| http://wikidot.com | 7 | 36 | 44 |
| http://angelfire.com | 7 | 56 | 55 |
| http://newsvine.com | 7 | 42 | 50 |
| http://www.newsvine.com/ | 7 | 71 | 67 |
| http://edublogs.org | 7 | 75 | 71 |
| http://blox.pl | 7 | 83 | 58 |
| http://angelfire.lycos.com | 7 | 93 | 71 |
| http://tripod.lycos.com | 7 | 93 | 75 |
| http://bravenet.com | 7 | 77 | 73 |
| http://www.yola.com | 7 | 83 | 83 |
| http://getsatisfaction.com | 7 | 85 | 64 |
| http://technorati.com | 7 | 88 | 75 |
| http://youblisher.com | 7 | 74 | 54 |
| http://jamendo.com | 7 | 81 | 60 |
| http://blog.de | 7 | 75 | 55 |
| http://keepandshare.com | 7 | 62 | 53 |
| http://drupalgardens.com | 7 | 64 | 55 |
| http://jumptags.com | 7 | 43 | 51 |
| http://rhizome.org | 7 | 79 | 62 |
| http://synthasite.com | 7 | 70 | 52 |
| http://miarroba.com | 7 | 79 | 68 |
| http://freewha.com | 7 | 24 | 43 |
| http://couchsurfing.org | 7 | 74 | 60 |
| http://www.couchsurfing.org/ | 7 | 74 | 67 |
| http://quizilla.com | 6 | 61 | 76 |
| http://fc2.com | 6 | 51 | 60 |
| http://4shared.com | 6 | 93 | 73 |
| http://zing.vn | 6 | 81 | 59 |
| http://shutterfly.com | 6 | 54 | 53 |
| http://www.shutterfly.com/ | 6 | 83 | 69 |
| http://blog.pchome.com.tw | 6 | 87 | 53 |
| http://hubpages.com | 6 | 91 | 70 |
| http://hubpages.com/ | 6 | 91 | 70 |
| http://zimbio.com | 6 | 90 | 66 |
| http://www.zimbio.com/ | 6 | 90 | 73 |
| http://redbubble.com | 6 | 87 | 65 |
| http://blog.com | 6 | 49 | 56 |
| http://skyrock.com | 6 | 49 | 57 |
| http://ghanaweb.com | 6 | 76 | 56 |
| http://ucoz.com | 6 | 89 | 61 |
| http://care2.com | 6 | 89 | 62 |
| http://dzone.com | 6 | 80 | 63 |
| http://webnode.com | 6 | 31 | 45 |
| http://eklablog.com | 6 | 23 | 42 |
| http://yudu.com | 6 | 68 | 57 |
| http://wayn.com | 6 | 60 | 54 |
| http://travelplus.wayn.com/ | 6 | 60 | 48 |
| http://socialmediatoday.com | 6 | 78 | 62 |
| http://unblog.fr | 6 | 38 | 78 |
| http://dreamwidth.org | 6 | 84 | 59 |
| http://wetpaint.com | 6 | 83 | 61 |
| http://albawaba.com | 6 | 80 | 59 |
| http://rebelmouse.com | 6 | 86 | 60 |
| http://blogtalkradio.com | 6 | 86 | 62 |
| http://squidoo.com | 6 | 90 | 67 |
| http://moonfruit.com | 6 | 35 | 42 |
| http://buzznet.com | 6 | 84 | 62 |
| http://dailystrength.org | 6 | 77 | 62 |
| http://soundclick.com | 6 | 73 | 56 |
| http://bitcomet.com | 6 | 71 | 55 |
| http://freehostia.com | 6 | 38 | 52 |
| http://blackplanet.com | 6 | 65 | 60 |
| http://sitew.com | 6 | 81 | 52 |
| http://travelpod.com | 6 | 77 | 57 |
| http://netlog.com | 6 | 73 | 59 |
| http://kidblog.org | 6 | 56 | 57 |
| http://snackwebsites.com | 6 | 34 | 43 |
| http://travelblog.org | 6 | 74 | 54 |
| http://blog.co.uk | 6 | 64 | 55 |
| http://doodlekit.com | 6 | 56 | 71 |
| http://areavoices.com | 6 | 75 | 53 |
| http://allvoices.com | 6 | 69 | 54 |
| http://twoday.net | 6 | 64 | 56 |
| http://quizilla.teennick.com | 6 | 78 | 59 |
| http://migente.com | 6 | 52 | 52 |
| http://www.migente.com/ | 6 | 52 | 59 |
| http://friendster.com | 6 | 83 | 68 |
| http://hotklix.com | 6 | 46 | 48 |
| http://blogsome.com | 6 | 75 | 61 |
| http://datahub.io | 6 | 55 | 51 |
| http://bravejournal.com | 6 | 59 | 55 |
| http://en.over-blog.com | 6 | 46 | 75 |
| http://blog.fr | 6 | 55 | 45 |
| http://multiply.com | 6 | 61 | 60 |
| http://zootoo.com | 6 | 47 | 47 |
| http://sphinn.com | 6 | 50 | 59 |
| http://blog.yahoo.com | 5 | 56 | 52 |
| http://blog.interia.pl | 5 | 92 | 55 |
| http://myanimelist.net | 5 | 88 | 66 |
| http://mouthshut.com | 5 | 58 | 53 |
| http://centerblog.net | 5 | 25 | 39 |
| http://yuku.com | 5 | 31 | 50 |
| http://gaiaonline.com | 5 | 77 | 61 |
| http://soup.io | 5 | 36 | 48 |
| http://www.soup.io/ | 5 | 89 | 74 |
| http://bravesites.com | 5 | 24 | 39 |
| http://forumotion.com | 5 | 25 | 40 |
| http://ge.tt | 5 | 75 | 67 |
| http://fotki.com | 5 | 79 | 60 |
| http://jigsy.com | 5 | 42 | 48 |
| http://foroactivo.com | 5 | 84 | 52 |
| http://23hq.com | 5 | 55 | 57 |
| http://kiwibox.com | 5 | 69 | 60 |
| http://pen.io | 5 | 88 | 92 |
| http://beep.com | 5 | 23 | 39 |
| http://page.tl | 5 | 26 | 37 |
| http://ipernity.com | 5 | 67 | 54 |
| http://www.smore.com/ | 5 | 75 | 65 |
| http://own-free-website.com | 5 | 34 | 55 |
| http://www.own-free-website.com/ | 5 | 53 | 75 |
| http://sosblogs.com | 5 | 53 | 55 |
| http://www.sosblogs.com/ | 5 | 53 | 62 |
| http://spruz.com | 5 | 23 | 40 |
| http://jambase.com | 5 | 68 | 54 |
| http://tribe.net | 5 | 65 | 58 |
| http://pusha.se | 5 | 48 | 54 |
| http://onsugar.com | 5 | 78 | 57 |
| http://www.kickofflabs.com/ | 5 | 51 | 51 |
| http://travellerspoint.com | 5 | 63 | 51 |
| http://snappages.com | 5 | 63 | 61 |
| http://cabanova.com | 5 | 58 | 55 |
| http://doomby.com | 5 | 60 | 50 |
| http://thoughts.com | 5 | 57 | 57 |
| http://webgarden.com | 5 | 20 | 37 |
| http://hazblog.com | 5 | 51 | 53 |
| http://blog.hr | 5 | 27 | 36 |
| http://filesanywhere.com | 5 | 54 | 47 |
| http://43things.com | 5 | 61 | 56 |
| http://xfire.com | 5 | 74 | 58 |
| http://devhub.com | 5 | 28 | 39 |
| http://www.devhub.com/ | 5 | 46 | 50 |
| http://blog.com.es | 5 | 53 | 46 |
| http://mytripjournal.com | 5 | 45 | 44 |
| http://webspawner.com | 5 | 58 | 53 |
| http://www.webspawner.com/ | 5 | 58 | 59 |
| http://blogbaker.com | 5 | 42 | 47 |
| http://www.blogbaker.com/ | 5 | 42 | 54 |
| http://blogdrive.com | 5 | 58 | 57 |
| http://20minutes-blogs.fr | 5 | 68 | 48 |
| http://diaryland.com | 5 | 59 | 55 |
| http://www.asianave.com/ | 5 | 49 | 53 |
| http://wordpressy.pl | 5 | 44 | 46 |
| http://journalspace.com | 5 | 53 | 51 |
| http://sosblog.com | 5 | 56 | 52 |
| http://pdfcast.org | 5 | 61 | 51 |
| http://opendiary.com | 5 | 50 | 50 |
| http://crowdvine.com | 5 | 56 | 52 |
| http://shoutpost.com | 4 | 61 | 51 |
| http://mywapblog.com | 4 | 50 | 50 |
| http://experienceproject.com | 4 | 67 | 53 |
| http://bcz.com | 4 | 53 | 56 |
| http://docdroid.net | 4 | 82 | 54 |
| http://exteen.com | 4 | 34 | 49 |
| http://wallinside.com | 4 | 67 | 65 |
| http://postbit.com | 4 | 55 | 57 |
| http://freewebsite-service.com | 4 | 43 | 51 |
| http://kazeo.com | 4 | 66 | 54 |
| http://hatena.com | 4 | 52 | 44 |
| http://manifo.com | 4 | 59 | 53 |
| http://freepdfhosting.com | 4 | 61 | 50 |
| http://getjealous.com | 4 | 50 | 58 |
| http://slmame.com | 4 | 45 | 46 |
| http://maruta.be | 4 | 45 | 50 |
| http://soulcast.com | 4 | 42 | 47 |
| http://flixya.com | 4 | 60 | 55 |
| http://tblog.com | 4 | 54 | 53 |
| http://blog.wox.cc | 4 | 42 | 46 |
| http://postagon.com | 4 | 40 | 43 |
| http://zoomgroups.com | 4 | 38 | 49 |
| http://nexopia.com | 4 | 50 | 53 |
| http://sailblogs.com | 4 | 48 | 46 |
| http://beeplog.de | 4 | 45 | 48 |
| http://fotopages.com | 4 | 54 | 53 |
| http://www.ourstory.com/ | 4 | 51 | 53 |
| http://vefblog.net | 4 | 57 | 48 |
| http://workitmom.com | 4 | 53 | 50 |
| http://yousaytoo.com | 4 | 56 | 49 |
| http://jux.com | 4 | 60 | 55 |
| http://a-thera.com | 4 | 30 | 43 |
| http://ohlog.com | 4 | 45 | 48 |
| http://blogspace.fr | 4 | 56 | 47 |
| http://geckogo.com | 4 | 45 | 46 |
| http://www.geckogo.com/ | 4 | 45 | 54 |
| http://iloveblog.com | 4 | 33 | 42 |
| http://bigcontact.com | 4 | 44 | 46 |
| http://www.ziki.com/ | 4 | 55 | 57 |
| http://20six.co.uk | 4 | 47 | 48 |
| http://trusted.md | 4 | 42 | 43 |
| http://blogskinny.com | 4 | 30 | 48 |
| http://unityfirst.com | 4 | 30 | 39 |
| http://de.la | 4 | 32 | 45 |
| http://purevolume.com | 3 | 85 | 73 |
| http://www.purevolume.com/ | 3 | 85 | 72 |
| http://selfgrowth.com | 3 | 63 | 56 |
| http://inube.com | 3 | 54 | 57 |
| http://insanejournal.com | 3 | 60 | 58 |
| http://friendsite.com | 3 | 37 | 48 |
| http://blogigo.com | 3 | 43 | 53 |
| http://joe.pl | 3 | 42 | 45 |
| http://mymfb.com | 3 | 38 | 42 |
| http://iblog.at | 3 | 44 | 48 |
| http://space.travel | 3 | 33 | 43 |
| http://bloghi.com | 3 | 45 | 52 |
| http://vip-blog.com | 3 | 53 | 43 |
| http://iseekblog.com | 3 | 35 | 45 |
| http://busythumbs.com | 3 | 45 | 45 |
| http://yourtrainings.com | 3 | 30 | 45 |
| http://sweetcircles.com | 3 | 41 | 44 |
| http://bloggers.nl | 3 | 43 | 47 |
| http://bloggerteam.com | 3 | 30 | 39 |
| http://awebcafe.com | 3 | 41 | 42 |
| http://blurpalicious.com | 2 | 47 | 54 |
| http://worldvillage.com | 2 | 50 | 45 |
| http://greasy.com | 2 | 30 | 38 |
| http://fizzlive.com | 2 | 43 | 46 |
| http://uwcblog.com | 1 | 36 | 46 |