The evidence for this is rather plain to see at this point in history. ;)
Sort of.
Wikipedia @ 2:
> Mark Zuckerberg built a website called "Facemash" in 2003 while attending Harvard University. The site was comparable to Hot or Not and used photos from online face books, asking users to choose the 'hotter' person".
Britannica:
> Despite its brief tenure, 450 people (who voted 22,000 times) flocked to Facemash. That success prompted Zuckerberg to register the URL http://www.thefacebook.com in January 2004.
> They pretty much put it on the label; it’s not called personality book.
Wikipedia @ 3:
> A face book or facebook is a paper or online directory of individuals' photographs and names published by some American universities.
Wikipedia @ 2:
> Zuckerberg coded a new site known as "TheFacebook", stating, "It is clear that the technology needed to create a centralized Website is readily available ... the benefits are many."
[1] https://www.britannica.com/money/Facebook
"People just submitted it. I don't know why. They 'trust me'. Dumb fucks." -Mark Zuckerberg
Maybe so, but have you seen Zuck's wife? I'm pretty sure he could find someone hotter to date if he cared to. There must be armies of gold-diggers after him. And yet he seems happy with his imo rather plain looking wife. Well done them both!