Websites PR Alexa https://delicious.com/ 8 1498 http://www.citeulike.org/ 8 13559 https://www.delicious.com/ 8 1498 http://www.reddit.com/ 8 38 http://www.stumbleupon.com/ 8 194 http://digg.com/ 7 587 https://www.diigo.com/ 7 1997 http://www.newsvine.com/ 7 4102 http://www.scoop.it/ 7 773
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