graeme_p - 12:07 pm on Apr 17, 2013 (gmt 0)
Very often I do not know.
There used to be MS advocates on Slashdot who all said almost exactly the same thing. I never really knew if they were:
1) Astroturfers with a script.
2) Fanatical fans who just all sounded the same (possibly repeating each other or PR from the same source).
3) People trying too hard to counter the site's perceived pro-open source/anti-MS bias (I say perceived because so many people were doing this, it was not true any more).
Astro turfing is definitely very widespread: