In the last couple of weeks, I saw a video interview of a message development team. I canβt remember where I saw him, otherwise I would post a link.
Basically, they had the whole team - developers, designers, people with data, project managers, all in one room, very open space, and they engaged in fights every day. That's all I can remember without finding the link again.
EDIT: Found this account today http://framethink.wordpress.com/2011/01/17/how-facebook-ships-code/
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