Pinterest is on-line for two years. During these two years, it gains big growth, but it needs invitation before you can register on Pinterest. Now Pinterest announces open registration, it means that anyone can register on Pinterest with emails, Facebook or Twitter accounts, no need to get invitation from others.In its official blog, Pinterest says: We’re really excited to have the capacity to offer Pinterest to more people and if you’re a Pinner with friends who’ve been waiting on the sidelines, we hope you’ll let them know. Happy pinning to everyone!In February, the m...

Digital marketing services company Experian Marketing Services's latest report shows the picture sharing website Pinterest has become the 3rd largest social network website in US following Facebook and Twitter. Its visits are more than LinkedIn and Google + now.Experian conducted a survey about social networking site visits in March,2012, the results show that visits of Facebook were more than 7 billion  Twitter got 182 million visits, Pinterest 104 million. However, the survey does not include mobile traffic.Pinterest's visits in March were more than LinkedIn, Google + MySpace, a...