People can do this manually now given enough time by looking at where the person lives, what sort of things he writes about, how he writes (word frequency analy

People can do this manually now given enough time by looking at where the person lives, what sort of things he writes about, how he writes (word frequency analysis etc.). It's only a matter of time before computers can do it too and it's accessible in search engines as "find more results by this person" or something like that.