While “spammy behavior” is one of those nebulous terms, it’s still in the rules and clearly prohibited. Again, this is to preserve a quality user experience for all users. According to Mr. Hoffman, “…pins that feel “spammy” to their followers…” are something they’re trying to avoid. While Mr. Hoffman didn’t elaborate on every instance of what “spammy” means, he did provide these examples: encouraging entrants to create multiple boards or pins, with each as an entry; requiring comments on certain pins; voting on specific boards/pin.