system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why does Facebook allow you to read the pre- edited posts of other users?
gpt
Imagine this scenario. 

1. Person comments "I love your outfit."
2. 17 people "like" the comment. 
3. Person edits comment to read "Hitler did nothing wrong."

Now you have 17 people liking "Hitler did nothing wrong." If you can't see the original comment, that looks like the 17 people are total assholes. Because you can see the comment is edited (and what the original edit says) you have some idea of what was originally "liked."