Skimmed these two interesting posts from different blogs on how Facebook's "Engineering Driven Process" works. I can see some similarities and some differences from FOSS process.
While it's true up to a point that FOSS process differs from project to project based on the community, I think there's enough in common that an interesting piece could be written for opensource.com comparing the two.
I'm not the right guy to do it. Not an engineer and not enough FOSS experience under my belt, but I'm sure someone on the Planets would be the right person, or people, to give it a shot.
Here are the links...
a detailed response thread
Looking forward to reading the future piece :-)