incrediBILL

msg:4318971 | 1:07 pm on May 28, 2011 (gmt 0) |
Anything not deceptive to the user would be my guess, not baiting and switching content.
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volatilegx

msg:4356867 | 9:46 pm on Aug 30, 2011 (gmt 0) |
I've been running http_referer based cloaked page for more than a decade for a competitive area as part of a test of this very question. Result: no problems; top ranking.
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g1smd

msg:4356883 | 10:18 pm on Aug 30, 2011 (gmt 0) |
Be aware that many legitimate visitors do not present a referrer - the data is suppressed by some ISPs, by some "internet security" software, or by user choice (browser settings).
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lucy24

msg:4356902 | 11:19 pm on Aug 30, 2011 (gmt 0) |
That's good, isn't it? It means that the version seen by robots will also be seen by perfectly legitimate humans. If all humans had referers*, the no-referer version would only be seen by robots-- and that would be a problem. * Which they wouldn't anyway. What about bookmarks and type-ins? Those should be the visitors you love the best.
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phranque

msg:4357048 | 10:03 am on Aug 31, 2011 (gmt 0) |
getting slightly off-topic, but... email clients and non-browser web apps such as twitter apps won't send a referrer.
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