1) When did you start using it? I remember starting quite early, so maybe the well-maintained garden comes from the fact I did it gradually over the years, so I didn't notice the work?

2) It may be simply that Facebook caters well only to some lifestyles, while it conflicts with another. And/or personality types; I think I've noticed that the more extrovert people tend to use Facebook a little less - mostly to share funny stuff and coordinate the next real-life party. All the interesting discussions I have on Facebook are usually held with people who, like myself, aren't very party-going.