phiofx, #wikipedia has changed the world and is written in #php (at that point of "fractal of bad design" fame).
#openstreetmap has changed the world and is written in #ruby.
#mastodon is on its way for similar impact.
The choice of tech platform doesnt seem to have much correlation with whether a project will have impact.
There is an abundance of practically equivalent ways of implementing the same old ideas but a scarcity of really good new ideas...
