User identification methods

User identification methods used by social networks and which can be used by any websites, in general, are the following: 

Browser information:

-UserAgent and navigator settings. This is a text line used by client applications (in our case it is the browser) as their name. It includes several components.

-Screen resolution and visible area.

-Plugin set.

-Other changeable parameters. 

Storage:

-ETag-Web storage

-IndexedDB

-Web cookies, LSO Cookies, Evercookies

-HTTP Strict Transport Security

-History API

Link-type and location:

-IP address (Proxy)
-Domain Name System
-WebRTC
-Geolocation
-Timezone

Prints:

-WebGL
-Fingerprint Canvas
-Browser Fingerprint
-AudioContext Fingerprint
-Fonts Fingerprint