Here is my proposal for re-post manors:
1) If the original thread has an unusual thread title and cannot be found easily via the search bar, then a polite re-post reply and a link to the original thread will suffice.
2) If the original thread is easily found via the search bar, then a non-polite reply and/or an amusing searchbar/repost photo will suffice.
4) Anyone who replies "searchbar" or "repost" for a repost with an original thread which cannot be found via the search bar should receive an instant karma of 0 by all.
I think calling out someone for re-posting is fine, and helps prevent future reposts, but people need to recognize that not everyone reads every single thread, every single day.