Have you been waiting for an invitation to join Pinterest? Your wait is over! Pinterest has announced open registration for all. To join, simply create an account using your Facebook or Twitter account. Don't have either? Then sign up with your email address! We wrote about what exactly Pinterest isbefore, but in case you missed it, Pinterest is a virtual pinboard. It helps you organize all the amazing things you find online - you can pin recipes, clothes, even gardening tips. And not only can you keep track of your own interests, you can see what your friends have pinned too. Why should you join Pinterest? Well, it has quickly grown to become the third largest social network, after Facebook and Twitter. But it also offers real content. Find recipes, DIY projects, and more just by searching! So if you aren't already pinning, join now. We'd love for you to follow our boards, and we'd love to follow yours! Leave a comment with the URL to your boards, and we'll check them out.