I don't get it, where is the misery? Are people really so fragile that they get upset seeing some old classmate in a luxury car? I put off creating a Facebook account for a long time but eventually gave in. And I was pleasantly surprised to find how well it works for sharing photo albums with my friends and family.
My schedule was completely full with kids, lots of work, and little down time for hobbies or relaxation. But I got into the groove and was reasonably content. Enter Facebook's feed with endless updates from friends on vacations, attending conferences, exotic work travel etc., and suddenly I start viewing my own lot in a shitty light. My rational assessment was that things were fine, but I just didn't feel very good about it. I quit FB cold turkey and within probably a month these feelings evaporated.
I don't think fragile is a good description. I think it's simply reacting. If the shared family photos you mentioned started having a lot of stuff that you didn't like, you'd probably choose to avoid it.