Zach, you had some ideas on how to increase the number of followers signing up to follow conversations.
I think the longest-running idea we've had is to freeze the Follow button, so at any point while reading the conversation it was visible.
Another great one is to have the Follow button right at the top of the conversation. Even before someone starts to skim they might click to follow. That's pretty common behavior, and something I do in places like Facebook a lot. I'll save a link to read later, or share it before reading it myself.