I hang out with quite a few, though I don't know their Reddit names. There are Facebook groups dedicated to blind distance athletes and their guides. I've also served as guide before for road races and an Ironman triathlon.

Yes there are. On Twitter there are Blindbeader and KyleRobedo that I know of and Blindbeader has a blog called Life Unscripted.

Absolutely. Kyle Robidoux is the first blind runner to enter Western States. There are blind runners in a lot of marathons.