Daily: I can go a whole day of errands/school without socializing with anyone. I usually take the time to catch up with my roommates. If I randomly see people I know, I don't hesitate to socialize.
Weekly: I make sure to communicate with my parents once a week. I try and "go out" to the bars/etc at least once a week (sometimes 2 or 3 times though). Depending on where I am, I often run on a "once a week schedule" for doing something with each of my worthy friends. I'll operate with a checklist in mind.
Monthly: I try to catch up with close friends from high school with a long phone convo about once a month (sometimes its less often though).
I'm definitely not what you'd call "plugged in" to the immense social network. Though I do play "the game" quite well when I actually do "plug in". I think its because I have much higher standards for what constitutes "a friend". It leads me to tend a lot less to my acquaintances.
I think I read somewhere that the average person has about 5 "good friends". This is not the median. it is possible that a few have 20, while others have 1, though I think its actually a good approximation to say most of us have about 5 good friends: the INTPs all the way to the ESFJs. The difference is just who labels their acquaintances as friends. I think it speaks volumes about how E/I MBTI has nothing to do with how much of a social tycoon you are....