Repeat after me: Pinterest is not a social media platform.
When was the last time you conversed with someone over Pinterest? Let me rephrase that. Have you ever had a conversation with someone on Pinterest?
I'm going to go out on a limb and say that the answer to that question is no.
Most people consider Pinterest to be a social network because you can share stuff, but that idea doesn't necessarily hold much water. Amazon allows you to make wish lists public, thereby in a sense sharing. Yet no one considers Amazon to be a social network.
Yes, you can add comments to a Pin. But in all honesty, threaded comments on a blog work better. Of course, we don't consider blogs as social media platforms.
I'll hand it to you that Pinterest does have certain social elements. After all, you can follow your favorite people and specific boards. But is that enough to call it social media?
If you consider Pinterest just a social platform, you're at a serious tactical disadvantage.
What is Pinterest really?