No, Notch posts frequently about Minecraft. So everyone who follows him but don't care about Minecraft will get those posts. That's the problem. The only solution now is for him to not post Minecraft related material to Public, but to a particular circle, say "Minecraft" which, due to how Circles work now, he has to bear 100% of the effort to maintain the people in it, which is not feasible (as I described above).