Pinterest, the online pin board where users can share things they like from around the web has enjoyed rapid growth since its launch in 2010. Right now it is growing faster than Facebook and twitter were at the same time of their lifespan. The sign up process of any website is crucial to its success or failure and the Pinterest sign up process is super easy, beta invite requirement aside.
Sign up is all about a users motivation to access the service that is behind the form. If you can get your potential users highly motivated to use your service, then the form should become almost irrelevant. However, that doesn’t mean designers of web forms should become lazy just because they have a killer service offering.