Do you think you might be affected by this type of thing if you were not warned. What precautions could you take to reduce the chance of this. Is facebook an information system? What do you think is the data / information of this system ?

I do not think i would be affected by this type of thing even if i wasn't warned as i do not place valuable data on my facebook. The only thing can only probably be classified as valuable is my email. If my email gets hacked then yes i would be affected.
Yes, i think facebook is an infromaiton system. The data/information in this system are the names of people around the world and whatever information they place about themselves on thier facebook profile. such dat would include age, email, gender or where they live.