Kat Hagan

This plugin allows you to selectively disable comments for visitors from certain sites (e.g. reddit). If a visitor’s HTTP referer matches one of the hosts you’ve blacklisted, your post will look as if comments have been disabled (neither existing comments nor the new comment form will be shown).

Disable Comments By Referer

Ban visitors from certain sites from viewing or adding comments.

PHPApps

Webmasters can use this tool to prevent their site from appearing in the backlink statistics of another webpage and server logs of referred pages as referrer. The operators of the referred pages cannot see where their visitors come from any more. Untrace.me provides a slick, quality derefering service for free. No ads, interstitials or popups. We promise.
When using Untrace.me you don’t link directly to the external target web page but to Untrace.me which redirects your users to the desired page then. So the target page doesn’t get to know that the user actually came from your site.
UntraceMe removes the referer (referrer) from all external links on your blog. It does this by converting all outgoing links on your blog using the untrace.me service and effectively hides your site as origin of the referred link. This option can be activated in the UntraceMe Settings page.

UntraceMe Dereferer Service

Webmasters can use this tool to prevent their site from appearing in the backlink statistics of another webpage and server logs of referred pages as r …

Disable Comments By Referer vs UntraceMe Dereferer Service