Amnesiac social media makes a lot of sense. I was very surprised when I didn't see that Billy into Activity Pub platforms when I stumbled into that way back when.

Could be great against people who go through others older posts to harass them on an opinion they might not have anymore. Great too for younger people posting nonsense online that they'll regret in the future for one reason or another.

Being able to go into your settings and add an expiration dates to posts makes sense to me.