If you're running ads on Facebook, you've probably noticed the Facebook Audience Network as a placement option. For most of us, we just let it run as part of our campaign, or we select our own platform options and drop it off the list.

But have you ever taken the time to figure out exactly what the Facebook Audience Network is? It's changed a bit over the last few years, so I'm breaking it down and letting you know what, and who, the opportunities are best for.