> I am older than most Hacker News participants, and have lived in more than one place, and perhaps that's why 700 friends, not all of whom are active on Facebook, doesn't seem completely excessive.
People younger than me routinely have hundreds or thousands of facebook friends (I have 28, and could easily curate it down). To me it's an introversion / extraversion phenomenon, not an age or mobility one.
Your comment raises the interesting question of what the distribution of number of Facebook friends is among REAL users of Facebook counting other REAL users as friends, and how the distribution changes for various user characteristics. I have not seen good data on that.
People younger than me routinely have hundreds or thousands of facebook friends (I have 28, and could easily curate it down). To me it's an introversion / extraversion phenomenon, not an age or mobility one.