I started the disappearing likes thread and chose to receive emails and alerts, both choices that were there so I don't miss anything. (I believe that's what it asked for, I don't post very often)
I checked and I am following Nifty. I'm also following Casportpony. But I'm not following blackdust951. Or most of the other posters on the disappearing likes thread.
I thought choosing the alerts/email alerts meant we received alerts for all incoming posts, regardless of whether or not we're following the people posting.
(I'll admit I'm not sure what following does, other than to show you when certain people are currently active on the site.)