I believe he thinks you meant how many replies a topic has and by who as there is a option that lets you see the replying list "###" is for the total number of replies the topic has
But the little feature at the bottom that showed who was viewing the topic is now gone
Not sure if it's ever coming back as it was still being used even when the new system was active (It later was removed)
Wow, that sucks. I don't get why anyone would want to remove it. So now we get to see the last 5 people that looked at our profile, which is useless, but not who is viewing a topic, which is quite useful.