If you have a verified account, Pinterest will give you a follow link. Having a backlink from Pinterest is a bomus to traffic generation. When content is interesting to your Pinterest audience it will get repinned and the more repins it has, the more traffic and backlinks it will gain.
Consider Pinterest as one of the best traffic provider for your main site and not as a backlink. By posting interesting features from your site will be the best way to attract target audience.