> Yes. And now Facebook is spending a ton of resource and > man-hours programming around this. They had to write > their own compiler! Is there a project o

> Yes. And now Facebook is spending a ton of resource and > man-hours programming around this. They had to write > their own compiler! Is there a project of Facebook scale which does not have "their own" at the very core, no matter initial choice of technology? My understanding is that by solving problems no one had to solve before you are bound to create "your own" stuff. Even for desktop — didn't Excel have it's own compiler?