[otakucode]

Many would probably hear of experiences like that and think 'hey that sounds unintentional or like behavior the advertiser wouldn't want' but it actually sounds brilliant from a pure effectiveness point of view. You don't just show an ad to an interested person.... you increase the chance that the person will hear about the thing from people in their immediate vicinity. And what's the best advertising in the universe that no one can buy? Word of mouth.

Advertisers had better be paying through the nose for this sort of access, because it's insanely valuable.