When yo link to any article on Internet, a notification is send to that website owner in the form of trackback or pingback. Whenever you link to any website, there are various services that can track the liking and send information on how many referrers are sent from your website.
This is ofcouse not problem but sometimes you just don’t want to allow anyone to track you or may be if you don’t want any website owner consider your website or whatsoever may be the reason, there are many free services that allows you to stop referrers on external links on your website. Continue reading Hide Referer And Anonymize All External Links In WordPress