You have a fair point, but I don't like being repackaged into a product if it gets in the way of my using the service. Like the continual "Wouldn't you like to add more information to your profile" prompts. Their overt attempts to steer you towards providing them useful information is just oppressive.
I don't really use Facebook, so I imagine I don't have a beef. But there's a fine line, and Facebook is continually over it.