Users can choose to sign up either using their Facebook or Twitter accounts or through an e-mail address as well.It is mentioned on blog of Pinterest that,"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!"
This will help Pinterest that more user will attract to this popular social networking site. Presently there are 1.1 million users on Pinterest. As per reports from social media marketer Tamba in April, the social photo sharing service had doubled its number of daily unique visitors to 4 million since January.