I made a comment or two, like twenty comments back, and I'm still tagged. I've long since lost interest in the conversation, and I want to stop getting the Notifications. I know I'm partly remembering Twitter, but I'm sure here I've used some kind of Mute This Conversation thing, and it just means I don't see the Notifications any more. But now when I click, I don't see that. I'm certain it used to be there.