Shouldn't you be blaming the site for only giving you only one option? Why didn't they provide a second?

If someone wants to use a website, they should use the website. If they don't want to use the website (this includes the login mechanism) then they don't. If your belief that Facebook logins are a bad thing is widespread, people will stop only implementing Facebook logins because it's a bad business decision. Stop whining because the market doesn't agree with you.

> If someone wants to use a website, they should use the website.

…except when that website first make you use facebook.

> If your belief that Facebook logins are a bad thing is widespread, people will stop only implementing Facebook logins because it's a bad business decision.

These things are a slow process.

> Stop whining because the market doesn't agree with you.

Luckily, my "whining" (the part about the social logins that you could only argue against, my privacy points were bulletproof and spot-on) is backed up by evidence:

http://www.emarketer.com/Article/Privacy-Concerns-Keep-Users...

https://news.ycombinator.com/item?id=5408735

https://news.ycombinator.com/item?id=4603204

That's not really Facebook's fault though.

Are you sure that it isn't something somehow related to Facebook which makes those site to use Facebook login, and not, say, its own?

What is this something that forces sites to use FaceBook login and not implement their own?

People who complain about yet another login they have to use when "you can just use Facebook or Twitter to login"

That's an argument for implementing both Facebook and native logins. It's not an argument for refusing to implement native logins at all.

twitter accounts are the best near-universal logins. fast to setup, complete anonymity and easy 2 click comment signin.

I agree, but it still comes back to the same problem. Relying on another site membership. What if SiteA uses Twitter to login because they don't want to make people have yet another login account, but I don't have a Twitter account... Great, so now I have to sign up at Twitter to sign up at SiteA... Making me have to have an account at a site I don't want to have an account at, just to have an account at a site I DO want to have an account at, just because Twitter is more popular.

That's as arbitrary as saying you must have pink hair to use my website. It's a dumb decision on the companies behalf, and for that reason not a legitimate concern with reputable companies.