<P> By the end of December 2016, Wikipedia was ranked fifth in the most popular websites globally . </P> <P> Unlike traditional encyclopedias, Wikipedia follows the procrastination principle regarding the security of its content . It started almost entirely open--anyone could create articles, and any Wikipedia article could be edited by any reader, even those who did not have a Wikipedia account . Modifications to all articles would be published immediately . As a result, any article could contain inaccuracies such as errors, ideological biases, and nonsensical or irrelevant text . </P> <P> Due to the increasing popularity of Wikipedia, popular editions, including the English version, have introduced editing restrictions in some cases . For instance, on the English Wikipedia and some other language editions, only registered users may create a new article . On the English Wikipedia, among others, some particularly controversial, sensitive and / or vandalism - prone pages have been protected to some degree . A frequently vandalized article can be semi-protected or extended confirmed protected, meaning that only autoconfirmed or extended confirmed editors are able to modify it . A particularly contentious article may be locked so that only administrators are able to make changes . </P> <P> In certain cases, all editors are allowed to submit modifications, but review is required for some editors, depending on certain conditions . For example, the German Wikipedia maintains "stable versions" of articles, which have passed certain reviews . Following protracted trials and community discussion, the English Wikipedia introduced the "pending changes" system in December 2012 . Under this system, new and unregistered users' edits to certain controversial or vandalism - prone articles are reviewed by established users before they are published . </P>

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