For awhile now I've been strongly against the rampant addition of useless and ridiculous facebook apps. Many on the basis that they produce clutter and generally don't enhance the functionality, IMHO.
I also encountered my first outrage on the subject of privacy protection when Facebook introduced Facebook Beacon (you have to choose to turn this off). You can read about it here. Basically, if one was to be logged into facebook (according to facebook, other reports have shown you don't need to be logged into facebook) and bought a present for your friend, or the anarchist's cookbook, or some intimate apparel from cooperating sites such as Overstock.com or Fandango, that purchase would be heedlessly published on your newsfeed to alert all your friends as to your recently purchased items. Not a nice thing.
Now there's new privacy issues. This time the leak isn't driven directly by Facebook, but that facebook is allowing facebook apps to harvest/mine your personal data. Like superwall? I hope you like it enough to let them build a profile on you. They know your religion, sex and hometown. Why do they need that info? Well, maybe they're selling it.