Earlier quoted context omitted.
At their age? Not a whole lot. But then again, Zuckerberg was about that age when he built the first version of facebook. It's not rocketscience. The problem is, there is facebook now. And that sets the bar pretty high. Going up against the proverbial 800 pound gorilla makes for a great story but it will probably end in some squashed egos. The book rights will be worth something though :) Just like duck-duck-go isn't…
What they are proposing is significantly more difficult than what Facebook initially wrote. Facebook, at one point, was just another web app with a nice story for bootstrapping new users via the college networks. These guys are trying to build a distributed, secure, encrypted network on which to build social networking functionality. If they do it correctly it could be the basis for a whole lot more. And even if they…
Anyway, they now have enough money to hire a competent programmer or two if they get stuck :)