Loved this post today on Frame Think:
http://framethink.wordpress.com/2011/01/17/how-facebook-ships-code/ about how Facebook ships code.
My favorite part:

“arguments about whether or not a feature idea is worth doing or not generally get resolved by just spending a week implementing it and then testing it on a sample of users, e.g., 1% of Nevada users.”

-Love it!

And then a Facebook employee corrected some of Frame Think’s blog’s assertions:
http://www.reddit.com/r/programming/comments/f3u0n/how_facebook_ships_code/c1d3b37

Don’t ya love developer gossip?