[buro9]

BTW, There is a big incentive to installing this hack. The reason is this:

Being invisible is something that most users like, the incentive to them is privacy. However this means that the number of actual people who appear to be online is lower than it really is.

New users to the forum use things like the Who's Online at the foot of the forumhome to judge whether they've found an active forum which lots of real people on. Active forums being better than dead forums.

You can't incentivise your users not to go invisible to help attract new members, because they don't care. But by installing this hack you have given users a clear incentive to not be invisible. And the result of that is that more users appear to be online, and that helps to convert new users as they see how active a forum really is.

I like this hack, it's one of my better small hacks, and is quite fun on the psychology side as you get to see who really values privacy, and who values openness