[amalcon]

Marketplace is part of it. In many regions, it's essentially replaced Craigslist for buying/selling random things like lawn equipment and children's toys.

Beyond that, I think it's pretty well documented (and also stands to reason) that the growth is mostly in communities with previously low penetration. If all of your family has reduced facebook usage over the last few years, that means you are in a community with previously high penetration. Of course you won't be able to anecdotally observe growth.