Today I abandoned Facebook. I urge you to do the same
medium.com
medium.com
But don't think you'll ever get others to leave. I've been trying since I left, and only succeded in convincing one person.
I abandoned facebook in 2012, deleting my profile entirely. I'd encourage the author to do the same. No need for half measures. You probably won't even notice that it's gone.
It would be great to have a Messenger-only mode including your existing contacts.