I was going to write a longer technical post, but instead here’s the bug summary from last week in a nutshell. I updated M.b so that editing a post’s date changes its URL (good!) but it was too aggressive about changing the URL unnecessarily (bad) which conflicted with what we call “instant publish” that tries to update the timeline immediately when possible. This caused duplicate entries in the timeline, and other confusion with clearing them up. Should all be working much more smoothly now.