Why is everyone upset about Facebook allowing user date to be accessed? From the time someone logs onto the Internet, just about everything they do is logged in some shape or manner.
When a device accesses a website, a whole series of events have to take place.
All information sent over the Internet is sent in the form of a packet. The packet has the sending IP address and the destination IP address.
First, the name of the website has be translated with an Internet Address. This is done through a Domain Name Server (DNS). Whatever device the user is using makes a request to the DNS server.