I just programmed an open source tool called semiphemeral that lets you automatically delete your old tweets, except for the ones you want to keep
For years I have considered developing a tool to delete old tweets selectively, with good defaults and strong configuration options, and now it looks like has gone and done it
I also decided to delete most of my old tweets, but while still keeping the ones that I wanted. I wrote an open source tool called semiphemeral to help me do this -- it turns out social media privacy is quite popular these days