How to find out the name of the person who visited the site?

Question

API

I would like to receive the IFO of the user visiting my site.
Is it possible?
It seems to me that there should be a service that can provide this data through the API using vk or fb. For example, if an application on a social network is very popular and every second person has given access to it, then this application can share it, then I will be able to know the IFO of every second person who visits my site.

Answer 1

Display a form for entering the full name, other passport data, phone number, at the second step, filling out a questionnaire to classify the client by social status, interests, solvency. At the third step, confirmation by entering a code from SMS. The form should float on top of the site and block its use until it is successfully submitted.

Answer 2

You've been pushed too far into sales. This is from the same opera as I was asked to make it possible for everyone who came in to drag a phone number, and his authorized VK, and if he did not leave a request, write to him in VK.
You will not be able to receive such information from the user unless he transfers it to you.

Answer 3

Not anymore. Previously, they somehow pushed scripts that pulled out information.
A separate cauldron has been prepared for such cunning * ops. Be careful!

Answer 4

no way to know

Answer 5

Try the service https://www.carrotquest.io/ - not advertising)))
Quote from the site
All users with all data in one interface
You will get access to each of your users or clients in a convenient interface.
You will be able to segment your users according to any data that you pass to the service.
You can export the collected data or transfer it in real time to other sources.
The service will add information about users from open sources (facebook, twitter, vk, and so on).