How can we get an invitation ? I can't even vote.

Any quora user can sent it (the invitation) to your email. If you are interested, I can do that.

I'm interested. I already enjoy participating in stackexchange.com. Could you invite me? Sent me a message to (disposable) zqxeT9Cl5ilpoN7q@bloem.joliekemulder.nl and I'll reply with my real email address.

To stay on topic, I recommend non-tech sites: Language Log, The Satorialist and London Review of Books (all easily found using Google).

Hello could you send me the invitation, please.

I need your valid email for this.

That's interesting... I just signed up using my Facebook account. Do you have a FB account?

Is any specific subject you follow in Quora ?

Yup, here are my topics: http://www.quora.com/Jinghao-Yan/topics

There are 71 of them at the moment, and some of them are overlapping