"The point being,"
", mind you,"
"I fully agree with"
"highlights a fundamental"
":" some text "," some text "."
", etc."
" - e.g."
"entirely dissimilar"
Whatever user has the most instances of these signature phrases is likely your man.
On the other hand that isn't proof of anything, but I think the changes are higher that someone will own up that didn't do it to throw sand in the eyes of the searchers than the reverse.
But then again, maybe I'm a sucker and I believe that people in general are honest and trustworthy. So far that seems to me to be a better assumption than the reverse.
http://news.bbc.co.uk/1/hi/8404025.stm
Relies on a person's vocabulary and writing style more than the actual words.
[edit: disregard - I hadn't read deep enough to see that this was essentially the approach you had taken]
* collective pause to think
* pure-ad parked
These suggest to me a [highly proficient] non-native speaker too. "pause for thought" and "pure ad-parked" are correct versions.
* "intimate patterns" is an unusual turn of phrase in this context, would probably be "personal usage patterns"
* "high-end criminals" looks like an unusual hyphenation
This search gives a name - http://www.google.com/search?q=%22identity+management%22+roi....
The other things you point out encourage me to share your opinion, however.
I'm from the UK too.
"high end" has more uses than "high-end." For example, "I bought a car at the high end of my budget." In that case, "high-end" wouldn't make sense. In "datacenters have been targeted by high-end criminals," however, "high-end" is a compound adjective.
Alternatively, you could drop the hyphen and/or form an entirely new word: "highend." The word "highend" doesn't seem to have caught on yet, though. I suspect that's because "upmarket" covers the same meaning already and is less susceptible to these morphological mishaps.
(On seeing what OS X had to suggest as a correction for "highend," it suggested both "high end" and "high-end.")