Rule 1 - All content must show something that is objectively interesting as fuck. Just because you find something IAF doesn't mean anyone else will. It's impossible to define everything that could be considered IAF, but for a general idea browse the top posts of all time from this subreddit.
Posts:
-
must be interesting as fuck
-
can't be interesting just because of text
-
must go beyond something just being old
-
can't be art that you made