That's not really correct. There are more bits of information regarding the event of your comment than the spell. It was observed you read the GP. Your profile

That's not really correct. There are more bits of information regarding the event of your comment than the spell. It was observed you read the GP. Your profile is read, interests noted. Your comment history gives us probability of your making a comment today. All in all, pretty sure a much higher probability than "very small" in the sense that you intended it.