Allows managing the nofollow tag.
In order to prevent links from influencing search results and negatively impacting users, Google urges webmasters to use the rel="nofollow" on paid links.
By default XenForo does not add the rel="nofollow" attribute to external links posted by staff. This add-on overcomes this limitation by allowing the domain of such paid links to be added to a blacklist .
To read more about Google guidelines regarding PageRank, click the links below:
Link schemes | Google Search Central | Google Developers
Qualify your outbound links to Google | Google Search Central
Evolving “nofollow” – new ways to identify the nature of links
(Example of Options page)