I get that's closer, but it's still not that useful, because it doesn't actually capture how people use the software and whether that's changing.
People communicate with me via FB messenger, and I respond to them. Otherwise I don't use the app. Am I an active user?
Once a day I open it, realise it's shit and vacuous, and importantly my SIL (the only person I still use it to keep up with) hasn't made any useful updates, so I close it 20 seconds later (this one is me, fwiw). Am I an an active user?
I don't post anything, I just scroll through the same 200 friends I'd had for 10 years, with no movement or differing usage. Am I an active user?
I don't use facebook as a social tool, I have no friends etc, but facebook groups are used in my area to buy and sell things. The second people move to another site I'd happily move. Am I an active user?