Unrelated to Cambridge Analytica, I started de-escalating my Facebook usage a few months ago.
First, I turned off notifications on my phone for Facebook and Facebook Messenger. (I've had e-mail notifications off for years.) Next, I deleted the Facebook app from my phone. Then, I deleted the Facebook Messenger app from my phone. Finally, I force myself to log out of Facebook on my laptop every time I visit.
This combination strikes a better balance, for me, between the connecting benefits of Facebook and its addictive time- and emotion-sucking downsides.