I think I'm confused on what the term freemium means. I always thought it meant a product with both a free and paid tiers. This doesn't seem to match with "For

I think I'm confused on what the term freemium means. I always thought it meant a product with both a free and paid tiers. This doesn't seem to match with "For example, Freemium works really well when your user IS the product." Such services, like the Facebook example he cites, are free, not freemium. Right?