I don't think that limiting the photography or the means of the data collection is the solution. The law is going to have to apply post-mining. In my opinion,

I don't think that limiting the photography or the means of the data collection is the solution. The law is going to have to apply post-mining. In my opinion, we need to start treating data about users as intellectual property. Generally speaking, you don't have to worry about intellectual property when you're doing something personal. I can say "Just do it" all I want. In the same vein, I can make casual observations about random people on the street without having to worry about violating their privacy (that guy has cool shoes!). But if I start to use "just do it" in my business marketing materials, I'll be in trouble. Similarly, if I start keeping a database of somebody's shoes every time I see them so I can try to sell them something, that should be illegal.