Disney Infinity Fans

Its a feature that lets you monitor where people are.
What section of the forum they are in, if they are replying or composing a pm, if they are posting a message. All at the click of a button that's in the lower left corner of the page. You cannot see the users who have chosen to be hidden.

^ I didn't actually know you could click it for more detail. I just looked at the bottom of the index page. I probably won't click it very often. Also, I find it funny how it also tells you if someone is seeing who's online.

KyletheCartoonist: Seeing who's online
User: Seeing who's online

What does it look like when I accidentally leave the tab open on NAAH for an hour? Does it just look like I've been checking it the whole time?

Yes it does, and it's hilarious.