Why is facebook blue in colour?

Facebook has definitely gone through a large number of makeovers to be what it is today.
But one thing that never changed is its "Blue" theme. Ever since the time it used to thefacebook.com, the Blue theme has been the same. And let me tell you why.

The reason is that our own Mr. Mark Zuckerberg is red-green colorblind. A mammoth part of the people suffering from color blindness are actually suffering from red-green color blindness and Mark is one of them.


And for such people, blue is the best color to see. Leaving aside this medical condition, even then Blue is the most popular color online as the brain perceives it as a transparent background to the rest of the content a user is reading on the webpage.


And even the Facebook co-founder himself said in an interview that
 
            "blue is the richest color for me - I can see all of blue"