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...

If not invested by Andreessen Horowitz, GitHub might not be noticed by Forbes, CNN, New York Times. People didn't know this tool because it was very far away from the world -- GitHub is a project hosting service used by programmers.But to some programmers, it is not just a place for project hosting, it is`also the hub for open source projects, a place for programmers improving themselves and a social network for programmers.There are around 3.26 million projects hosted on GitHub currently, including Linux, Ruby on Rails, jQuery, Apache and the popular Node.js.Why is GitHub so popular?It is an ...