Can a couple of 20 somethings change the world? Stripe's answer is a strong affirmative YES. Stripe is fixing the biggest barrier to the social / mobile / connected web. We can't buy stuff on our phones.
Phones are, to use the founders of Stripe's words, "Clunky" (watch that video here: http://cnnmon.ie/1DxDZMG ). Why is the phone the lynchpin? Stop thinking of your phone as a phone.
Think of your phone as a PORTAL, game console and magic wand. Soon "see a thing, buy a thing" will be taken for granted but only if the Stipers can make mobile payments less "clunky".
I poked around on their site some and would say they are half way down a very interesting road. Why is the phone the lynchpin? Because once payments work on phones they work ANYWHERE.
Once payments work anywhere social commerce becomes a reality and "see a thing, hear a thing, buy a thing" a reality. Extend the logic further and ask, "What is a website?".
If we can wrap "see, click, buy" tech on phones we can do so on Facebook, the Redbox machine and the grocery store. Scan those fritos with your phone and Harris Teeter or Wegmans or Kroger bills your account.
NO CHECKOUT because your PHONE is the checkout. Fix ecom on the phone, change the world.