Yeah, the two online bits had diverse sources of information. The standard one was set to display all users that are still on the board, and the header was set to show the amount of users who have been online for the past hour. Of course, it'd be easy to fake a more active board like this, but honestly, who cares about a high user load when a board can contain useful information and be fun instead?
"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram