Re: Someday, machine spewed cr9p is all there will be.
easy to spot
Only when it's poorly done. Look at some of Bing Liu's work on machine-generated product reviews, for example; with a number of the systems in use, no one's yet identified any features that distinguish them from the reviews produced by humans with significantly better than random accuracy.
And this arms race has been going on for about as long as we've had online product reviews. It's an established area of R&D.