Few years ago there was an interesting affair. There was an IT guy whose laptop was stolen. The owner used his IT skills to get pictures of the new owners of his laptop (not neccesarily thieves) remotely. The owner shared some of the pictures on his blog.
The new owners noticed it and sued him for invasion of privacy or something like that. They won and the original owner was forced to pay them for the damage done.
My question is, how could these ordinary people sue somebody for taking their pictures without permission, when there are tabloid journalists who do this every day to celebrities ? (And obviously they get away with it.)