I'm late to the discussion here, but I use shreddit. It edits and deletes all my past comments.
However I found recently there are websites that have every single one of my old comments accessible and I'm sure reddit itself does to. Once you comment it's there forever.
If your submission/comment is older than 2 hours old, your ability to delete it expires. I'm also pretty sure you can't delete your account so that your comments that you don't delete within 2 hours or that admins don't delete remain on the record.
How? I can only delete for a small amount of time after posting. I cannot delete any of my past comments. If there is an option to remove old(er) comments I would sure like to know about it, seems to be hidden pretty well.
Don’t know if this is still the case but back when Reddit was open source they would keep the comment in the database on deletion, but using the edit feature you could actually remove the content from the db.
theres a limit for time (6 months?) for these via the website, and via the API theres a limit of 2000 or so latest comments, with no way to get the list of latest comments re-populated from older ones when your comments do get deleted. (They basically have a cassandra db for all the latest stuff, and an read only db for the old stuff. So the live db never gets updated from the old db.)
What this means is that your a lot of old comments and submissions are unable to be deleted.
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