So I clicked on this link and I see nothing but a form for registering.

The answer is no.

And only facebook too... It's a great service though.

I am constantly logged on to Quora so haven't seen the login form for ages, but I don't remember it was Facebook login only. I have a regular old school login there. I certainly don't link or join anything that forces me to link my Facebook account to it.

It is not facebook only. I don't use facebook. I don't remember now, but I may have logged in with Twitter authentication.

You're right, you can definitely login without a facebook/twitter account now.

See "I don't have a Facebook or Twitter account."

You can sign up with the link I don't have either facebook or twitter. Just full in name, email & password. all done :p you don't have to use any 3rd party services. Just signed up ... pretty good stuff. If you want some very focussed news about just about anything it's a great place to go.