When you signed up for Pinterest, you had the option of signing up with an e-mail address or logging in through Facebook or Twitter. If you chose to log in through Facebook or Twitter, finding potential followers is as easy as clicking your user name in the top navigation and choosing "find friends." You'll see a column of your Facebook or Twitter friends who are already registered for Pinterest. You simply click "follow" to follow them. You'll also see a column of your Facebook or Twitter friends who aren't on Pinterest yet, and you'll have an opportunity to invite them to join. If you joined with your e-mail, you can choose "invite your friends to Pinterest", or you can search your Gmail or Yahoo address books to find friends. Pinterest will have also automatically followed its top users for you. You can easily unfollow these folks if you choose.
When you follow people, their pins will show up on your home page. I followed the "talented, but certifiable" Sarah Marks, for instance. She is co-owner of Third Half Studio, makers of awesome zombie-inspired anime fabric prints, melamine dinnerware and gift items. Now, any new products she pins show up on my own home page.
Once I'd found some followers, I was able to start interacting with them. Learn about interacting with your followers next.