system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How "hackers" can find all of somebodys personal information so easily, with nothing to go off of but a reddit account, or something similar.

I've heard of people getting all of their personal information like birthdate, full name, and location released on the internet because of a controversial reddit post or something similar. 

How is it possible for someone to gain all of somebody else's information like this seemingly so easily?

Note: Not looking to do this to anyone, just genuinely interested and looking to learn how to better protect myself.
gpt
Look through a person entire comment history. Most likely they have given out tons of information like their age, location, educational history, name, etc over time. Any photos uploaded from a digital camera will have EXIF data which contains information like location so thats always a valuable source of information. From here they can just Google and search social media sites with the information that they have until they hit a match or just can't find anything.

How is it so easy? People are just unaware of how reckless they are with their data. People really are just beginning to fully realize the implications of the fact that something stays on the internet forever.