Criticism
Employment of the nofollow attribute by Wikipedia on all external links has been criticized by web authors for not passing the deserved rank to referenced pages which serve as the original source of each Wikipedia article's content. The decision was enacted on Wikipedia to combat spamdexing on its pages, which are an otherwise tempting target for spammers as Wikipedia is a very high ranking site on most search engines. The drawback for original publishers is that not only must they compete with the Wikipedia article for a higher rank in search results, their website does not receive the increase in rank that otherwise would have been contributed without nofollow.
Use of nofollow where comments or other user content is posted (e.g. Wikipedia) not only depreciates the links of spammers but also of users that might be constructively contributing to a discussion, and preventing such legitimate links from influencing the page ranking of the websites they target.
Read more about this topic: Nofollow
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