So, why are there so few of them online?
I beg to differ. Yes, there are "so few of them online" if you just compare them to those not online.
I haven't really looked in quite awhile, but there are many many many more ex-Mormons and they barely made a presence online compared to ex-JW's.
It would seem that, compared to just about any religious group, ex-JW's are the largest group of former members. (That is not a researched FACT, just an observance by me.)
I think there are a higher percentage within the JW's that were as JWDaughter said: "We were schmucks and/or took it all way too seriously." Taking it so seriously made us need to find solidarity. Or even if some among our group didn't take it so seriously, we left behind loved ones that do take it so seriously, and we seek solidarity from others that understand.