[davide101]

It goes by referrer. So the search bots should see the same thing that search visitors use. To do it any other way would put you at risk for being delisted from Google. The plugin is probably a tradeoff between search engine ranking (less content on the page, though still one post) and conversion rates. If you value the communication/longterm engagement more than the pageviews, then it may be worthwhile. If not, then it's probably a net negative.

In our first day of testing, our conversion rate is up 5x and our bounce rate is down 5%. We will be monitoring the long-term impact on our search rankings. You could always test it on a subset of forums for a few months and see how it works for you and what impact it has on your search traffic.