How to create authorization of social networks to enter the Internet?

Question

Facebook

I have a cafe in which I want to keep statistics of my guests and also know their gender and age.
There is an idea to create free - WIFI and in order to get access to the Internet you need to go through authorization through the social. networks such as FB and VK.
The question is how to organize all this?

Answer 1

according to the law through identification by documents, and so set up a hotspot

Answer 2

Hello.
You need a server (on it you raise a gateway that will release it to the Internet, close everything except the authorization pages) make a page with authorization through anything.

Answer 3

artem @ kirilovskiy . en