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High Page rank Dofollow social networking sites list .
Facebook is the one of the popular social networking site with more then 1 billion users .I would mark Facebook as no follow because its to hard even call it as impossible to get back-link from Facebook . Page Rank of Facebook varies in between Pr 8 to Pr 10 , Its to easy to get back link from Facebook , you can't just get Facebook back links from Facebook by just posting your website Url in your profile update. Obviously , Facebook is using no-follow Attribute for there user Profile and status update , however there is only way to get back-links from Facebook is through Facebook page ,Because after certain Facebook page likes ,Facebook page popularity , Certain fields of your Facebook Profile page like website Url Goes as " Do follow attribute " .Still Facebook is working on whole Facebook site to make as No-follow .
Twitter is the one of the first popular micro blogging social networking site with more then 500 million users , Getting Back link from Twitter is not impossible as in case of Facebook , we have see Thousands and thousands of so many sites even blog getting one way back link from twitter . Its not easy to get back link from twitter but not also difficult , you need to have atleast 10K+ followers and your tweets containing full url ( not short url) should be retweeted 10k+ times more then your followers then your twitter profile " My website field " goes do follow , This method are used by twitter as well as popular social networking site to Boost there seo and Healthy back linking .
Linkedin.com is the first popular social networking site of there kind linkedin.com is developed for professional people to Create and manage there professional profile to grow up there professional Networking . linkedin.com have more the 200 million+ users . Linked in 's page ranks keeps on bouncing from Pr 9 to Pr 8 . Getting one way back link for linkedin.com is bit easy as compare to twitter , you need a original Professional Profile and your profile need to reach certain Share ,likes and followers to make your Linkedin.com profile's website field to dofollow .
Pinterest.com is the first Pin-board style photo-sharing social networking site of it own kind with more then 350 million users .Pinterest's page rank varies in between Pr 7 to Pr 8 Getting One way back-link from Pinterest.com is the easy job , You can get back link when some popular User with Lots of followers and popular Pins Repin your website Links . Although Pinterest is not fully Do-follow , only pins of Certain user who Qualify as popular pinner pin's get do-follow back-links attribute .All social networking site are using this method to get Quality and healthy back-links .
Soundcloud.com is the well know Social networking sites for music lover ,In Soundcloud user can follow there favorite Musicians, create and share there own music with friends etc .Soundcloud.com grown to be a best Social Networking site for music lover with approx 50+ million users . Soundcloud.com's page rank varies from Pr 8 to Pr 7 . Getting backlink from Soundcloud.com is Same as Pinterest.com ,Twitter.com . Your profile popularity decides whether your profile fields are Do-follow or No follow .