Does anybody actually like seeing ads when they are browsing around Facebook? Who thinks to themselves 'I feel like buying something, let's log in to Facebook and maybe a random ad will come up for something that I want'. If people want to spend money, don't they just search for it or hit up Amazon? I wonder, if given the option to show adverts when you first sign up - how many people would select it?

Wrong. They show adverts based on personal information (groups, friends, events, etc.) used incredulously to target folks of interest. That doesn't mean that person wants to see an ad regarding a band they have on their profile.