Manual:$wgNoFollowLinks

Site customization: $wgNoFollowLinks
If true, external URL links in wiki text will be given the rel="nofollow" attribute.
Introduced in version:	1.4.0 (r7174)
Removed in version:	still in use
Allowed values:	boolean
Default value:	true

Other settings: Alphabetical | By Function

Details

If true, external URL links in wiki text will be given the rel="nofollow" attribute as a hint to search engines that they should not be followed for ranking purposes as they are user-supplied and thus subject to spamming. Defaults to true.

See also

• $wgNoFollowDomainExceptions
• $wgNoFollowNsExceptions