I know this is going a bit far, but there are other reasons where a nofollow could even kill a community based website. If we take for example the case of a well known community based website, where user would participate a lot to the content. What would happen if user would discover one day that, ...

While i was browsing and looking at the different forum platforms i noticed most of them have nofollow links to pages like the individual user page or other pages that present very little to no interest for the general user. It looks like the main concern was to concentrate the bots on the actual co...