After several years on Facebook, my interpretation is: Most people on Facebook are IN NEED, much more than most other people in society.
They hope by being here, that will find help in one way or the other. They are NOT in good shape. Either physical, emotional and mental or all of them together. They have been hurt, violated or misused, disrespected in some way AND they have NOT had the relevant help to process these old injuries/traumas, which have settled in the unconscious and now bring various defects such as inferiority, depression, lack of desire for life, physical pain, physical diseases, etc.
I better understand now, why I some time ago saw very little activity in groups with thousands of people. My conclusion: fear of touch. Fear of being bullied, laughed at etc.
People who have a 'good life' are either not on Facebook at all or spend very little time here.