That's just something admins (and maybe mods, I don't know) can do.
The only way this could be done by an app was if it saved a copy of every post and comment in case one of them gets deleted.
That's just something admins (and maybe mods, I don't know) can do.
The only way this could be done by an app was if it saved a copy of every post and comment in case one of them gets deleted.