Ads merging with Technology

Wow, it always amazes me what technology can do. I like this in the sense that it is custom advertising. I would be gathering all my friends and family to see how the ad would changes according to their features. I think it is a novelty and extremely fun.
The problem I see on the technology side is designing so many ads to really customize it. Some people my take offense if it is too generalized, such as based on ethnicity.
Overall, I am very curious about this and hope to see it in Michigan sometime soon.