Pinterest is no longer requiring invitations to join the social network. Everyone can now create an account. When I first joined Pinterest, it did not take me long to get a registration e-mail, but it is always nice to eliminate the waiting period. Pinterest is the fastest growing social network and is known for driving solid sales referrals to online retailers. Pinterest allows users to post their favorite videos, photos, and websites to an online pin-board. If you like this article, check out 16 of the best Pinterest applications and 14 free Pinterest style WordPress themes.