Pinterest now third biggest social network after Facebook and Twitter April 6, 2012 by admin Tweet A rising star in social media, Pinterest, has become the third most popular social network in the United States, after Facebook and Twitter. Read more… Neowin Related Posts:Facebook now lets you create multiple profiles on…Twitter is back up after a major outage caused by…Twitter says you can't link to rival social media…Twitter suspends accounts of journalists who cover…Social network Friendster apparently back, but its…