Anecdotally, I haven't been on Facebook in months. In spite of that, I wouldn't be surprised if my account is counted somehow in the daily usage for some of those days just because of the extent to which their services have extended throughout many other websites. I've joined, canceled, then joined again, but never really used the site to any large extent. It is a very unnatural (yet at times necessary) way to communicate with people.

The decline of Facebook is in no way the decline of technology-enhanced socializing. People will hopefully just find other more natural ways to do so. My hope is on decentralized apps that allow people to own and control access to their own data.