I don't see any reason why "nofollow" should be added to links to our wikis, it's against ourself.
Note: I think we can add wikimedia.org and include all subdomains; it's easier than selecting and adding them manually and I don't think that spam to wikitech, chapters wikis or whatever is a risk.
To expand (useless details follow if you're not convinced :-p): we should ideally use interwiki links to link our wikis, and that's what we usually do, but:
- this isn't always possible, for instance Commons and Meta are multilingual wikis and we often use {{fullurl}} to append a uselang= parameter to links, typically in interproject templates (used on hundreds of thousands articles);
- there's still no reason why, if a newbie doesn't know it, a standard link to a Wikimedia project should have a nofollow.
Examples of 1):
- [[:mw:Help:Magic_words#URL_data]]: {{canonicalurl:Category:Top level}} → <a rel="nofollow" class="external free" href="http://www.mediawiki.org/wiki/Category:Top_level">http://www.mediawiki.org/wiki/Category:Top_level</a>
- [[:q:it:Cesare Beccaria]]: <a rel="nofollow" class="external text" href="//commons.wikimedia.org/wiki/Category:Cesare_Beccaria?uselang=it">Commons</a> (added through [[:q:it:Template:Interprogetto]], [[:q:it:Template:Interprogetto/CollegamentoUselang]])
- [[:w:fr:Modèle:Autres projets#Catégorie de Commons]]: <a rel="nofollow" class="external text" href="//commons.wikimedia.org/wiki/Category:Plants?uselang=fr">« Autres projets », sur <span>Wikimedia Commons</span></a>
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