A few days ago, Facebook held a tech talk at their headquarters. The topic of the talk was pushing changes ? bug fixes, new features, product improvements, etc. Every day, Facebook engineers push hundreds of these; some big, some little. Most of the 600 million-plus users never notice a thing. And apparently, we're even less likely to notice changes due to a special feature Facebook has. The "Everyone But TechCrunch Can See This" feature. As Facebook engineer Chuck Rossi details around minute 23:00 in the video, Facebook has a tool they call "Gatekeeper" which allows them to be in control of who can see what code live on the service at any given time. As Rossi points out, right now on Facebook.com there is already the code for every major thing Facebook is going to launch in the next six months and beyond! It's the Gatekeeper which stops us from seeing it. 
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