Completely coincidentally, I had quit smoking a few weeks before.
The feelings of loss, difficulty in sleeping, feeling that something was missing, and strong desire to get back to smoking/FB was almost exactly the same.
And once I got over the hump, the feelings of calm, relaxation, clarity of thought, etc were also similar.
It was then that I learnt, well before anyone really started talking about social media being harmful, that social media (or at least FB…I didn’t really get into any other social media until much later), was literally addictive and probably harmful.