You know, I don't know how to get this myself, so any time I need to know my public IP address, I go to a website that displays it (usually by searching "my ip address" in DuckDuckGo), and it usually shows where I am, too. Except it's always several miles off, not even close. That's what a dynamic IP address is like: it's randomish, changes all the time, and provides no useful information to anyone by itself.

The reason Facebook recording this is a problem is it doesn't just record your IP address; it also records what webpage you were visiting when it recorded your IP address, and then it links your IP address to your account whenever you log in to Facebook. It might use cookies for this purpose as well; I don't know. The point is just knowing that some guy has IP address xxx.xxx.xxx.xxx is completely meaningless. Knowing that some guy with some IP address loaded the webpage is meaningless, too.

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