Examples of popular applications or websites made based on Ruby?

Answer 1

github, shopify, basecamp, goodreads,Groupon, hulu, yellow pages, ect.. twitter started out on ruby on rails.

Answer 2

A popular game called Gemstone IV is ruby,

Answer 3

class Sadface
def whatifitoldyou
puts "Almost no one loves Ruby except me and Yukihiro Matsumoto (Ruby Chief Designer)"
end
end