Why Facebook Is In Blue Colour???

Do You Know Why Facebook Is In Blue Colour???

Facebook has gone through some major redesigns in the past few years but one part that has more or less stayed the same in all those years is the site’s blue color.
Everything is so blue about Facebook right from the sign-up page to the logo, their mobile app and even the site pop-ups that have shades of blue. 
Why?
I was recently listening to an episode of Twig where host Leo Laporte pointed to this New Yorker story on Mark Zuckerberg that seems to explain why Facebook is all blue in color.

The young Facebook founder is color blind but can see Only blue Colour

"Colors don’t matter much to Zuckerberg; a few years ago, he took an online test and realized that he was red-green color-blind. Blue is Facebook’s dominant color, because, as he said, “blue is the richest color for me - I can see all of blue.”

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This is original design of Facebook when it was called thefacebook.com – you were required to have an .edu email address to even open an account on Facebook.