I already covered that in my original comment: it might not be a bad thing for you, but you are not everyone. There exists a significant number of people for whom quitting Facebook would have some real negative costs.

> I think as one gets older one finds that "Partying" with distant acquaintances becomes less and less an important part of one's social life.

Also getting invited to a party was just an example, and not all parties are booze-fueled keggers where you "party."

It's also not "distant acquaintances" I'm taking about. The group I'm talking about are the people 1) who you like enough to want to hang out with, 2) who like you enough to invite you, but 3) don't like you enough to always remember your special communication preferences unprompted.