Do they have to lose users? I'm still a user, but my engagement is way down. I largely use it to organize events I am hosting. I might respond if someone tags me in something. Otherwise I'm basically not using it. Speaking of which, the last event I hosted I invited 30 people. 16 of them did not see the invite. It used to be I had a few people I had to text or email because they would not see a Facebook invite. Now I basically have to include an event on Facebook out of inertia, but it's not the primary way I invite people anymore.