But when I was trying to track a topic, the topic name was shown as "test" when the current topic name is something else. Maybe the original topic name indeed was "test" and later was edited.
It was the original name, yes. Maybe I can make it so the first time someone tracks the topic the name is rescraped, I don't know... I'll see. 
So, I was tracking Royse777's posts and recently I noticed that I didn't get any notifications from his posts. It looks like this happened because he also recently changed his username. Just a suggestion: I think it would be better to use UID instead of the username if this is the case. I think this a valid point. This could help ensure that notifications delivered to users who are following specific accounts regardless of any changes in usernames.
Right, but name changes are still rare and using the UID seems worse for the user experience. I have an idea if it starts happening more often, but it's not my priority right now. 
