I would argue this already being taken advantage of (though 'exploited' seems a bit strong). There are pages such as this one: http://www.facebook.com/pages/96-

I would argue this already being taken advantage of (though 'exploited' seems a bit strong). There are pages such as this one: http://www.facebook.com/pages/96-percent-of-people-cant-figure-out-how-this-is-real/145455405484685 http://www.facebook.com/pages/96-percent-of-people-cant-figu... that require the user to 'like' it before they can see whatever it is. It would be interesting to see what sectors are targeting this new spam avenue. Facebook's anti-spam approach is largely effective though -- as a centralised service they have a lot of behaviour metrics to characterise misbehaviour.