Quora, the answerboard alternative to Stack Exchange and it many progeny, seems to have hit the takeoff point this week. With something like 500,000 registered members, I’m seeing a 10-fold increase in follow notifications. Others have remarked on the seeing the same thing. Usually about this time, the “old-timers” moan, grown and whinge about how the sudden onslaught of the masses is ruining “their” service. I can remember “there goes the online neighborhood” laments all…