Prototypes, Google Labs on Facebook
Facebook announced yesterday son blog the arrival of the page “Prototypes”, a kind of Google labs, but to Facebook.
The idea is the same, provide a preview of the release of the new features that have not been tested much.
It's like a beta, heads on, It Works, Ca bugs, and ultimately, we're happy when you install the final because we said we helped to develop the application 
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One can currently find five prototype applications on the page, but hey it could quickly increase if beta stagnate as long as Google's 
