I often hear Pinterest named among the social media sites you're expected to have an account on these days--and I do--but I'm not clear on how one really goes about using it for marketing purposes. It looks to me like you can certainly favorite other people's pins, and follow their boards, and sponsor pins, but is that it? For instance, could you suggest one of your pins to another individual for inclusion on their board? Or, failing that, do you have to pay to be included in the (individualized, I think) newsletter with suggested pins? How do you get your pins more popular?