Pinterest is a good way to express creativity and share with friends/strangers ideas or anything cool you may have seen. Although pinterest may seem a little silly or confusing at first, the website actually serves many good purposes. The website is open for viewing but in order to completely participate, one must be 'invited'. While getting invited may take a mere 24 hours, these 24 hours may deter ones interest in the website. Hence, this may be seen as a con. Also, new users may find themselves confused since pinterest is not user friendly and it takes some getting used to.
Ultimately, I think the website's main purpose is to help individuals share ideas and interests with one another, whether recipes, DIY crafts, or decorating. The various options helps this website remain successful and promote its popularity. Personally I use Pinterest, and although not very often, I would recommend it to a friend.