People sometimes call it a "digital tattoo": text or photos you put online that are hard to remove later, like ink on skin.
It isn't a word meant to scare you. Knowing why things stay lets you think once before you post.
Why It's Hard to Remove
You can delete your own post, but anyone who saved it still has it. Screenshots take a second, and you never find out.
If others quote it or repost it elsewhere, you can't delete those. The wider it spreads, the more places there are to remove.
What Those Few Seconds Are For
Stop before you send and ask, "am I fine with this staying?" If you're unsure, sleep on it and decide tomorrow.
People who choose assuming things stay don't get caught out later. Almost nobody regrets what they didn't post.
Before posting, stop once and ask yourself whether you're fine with it staying.
At Digital Kodomo BASE, we value the few seconds before you post.
Check What is a digital tattoo?