WordPress.org

Why is site X on the list when it does not use nofollow?

Blacklisted sites are from the 'Top 1000' Quantcast list. Most of random sites from the list that I checked use nofollow.

How do I add or remove sites from the list?

You can add or remove sites directly in the 'nofollow-reciprocity.php' file.

Although you can add individual sites to this blacklist, the intention of this plugin is to create a massive effect. Instead of adding a handful of websites, consider adding many. You are welcome to send me lists of bad sites you find, or good ones that are on the current list. Eventually, we will have an ultimate list of nofollow sites.

Do you think this plugin will have a significant effect?

On your blog, yes. On the web, only if you spread the word and blog about it.