Advertising is only annoying when it isn't targeted enough. Perfectly targeted advertising will be indistinguishable from any other piece of information in the

Advertising is only annoying when it isn't targeted enough. Perfectly targeted advertising will be indistinguishable from any other piece of information in the near future with advanced recommendation engines. I'd be curious to know how will this perfectly targeted advertising find its perfect targets for, say, selling V1aGra.