Please, stop the denialism.
Windows 10 works smoothly on an Atom N270 or Core 1 Duo. Unity, on the other hand...not so much.
A basic composited desktop with basic animations does not require that much horsepower. Even a measly GMA950 is more than enough. Even VIA C7-M with Chrome9 graphics ran Windows 7 with no hiccups and all 3D eyecandy enabled.
Linux is terribly bloated and unoptimized.
The only reason I have an account is for friends and family - I wonder how many other accounts are purely for this reason?
Huh? Keeping up with friends and family is the main purpose of Facebook.
Evolution is a million line computer program falling into place by accident.