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Since many publishers are using images near by ad unit and found success, Google will probably launch something new. Images appear randomly (generic, related to the ads), and they are not choosen by advertisers.
Does someone hear anything more about this?
Could be promising, although it does introduce a new element into the design of the site that I didn't intend to be there. If it increases CTR/ROI enough, it may be worth it. I wonder also, will it be a novelty that eventually fades as visitors get used to it?