Aren't those apps?

Not by most common sense definitions, no. Here's a simple one for you: if you don't need to use the app store to get it, it's not an app.

Then Facebook and Skype do count as apps, I guess. (Unless I uninstalled Facebook without ever launching it and it came preinstalled. I may not remember.)

That's not really a good definition. The really popular apps come preinstalled, at least they did on my current mobile.