The Referrer Assignment gives you the ability to display a box to visitors coming to your Joomla! Website from a specific website or a list of websites by using their domain names as an indicator.
In the table below you can see which options are available to setup the Referrer Assignment.
In this textbox you can type in your Referrer URLs or parts of them one by one separating them in new lines.
Or even like this:
Or even a mix of them if you'd like but there's rarely a use case for typing them mixed.
A very common use case for the Referrer Assignment is when you want to show a box for a user who is coming from an affiliate site or a social network like Facebook. For instance, if the user is somehow coming to your Joomla! Website from Facebook then perhaps you'd like to let him know that you also have a Facebook Page for him to like.
The Referrer Assignment at the present time that this article is being written can only support entire domain names as referrers. It is planned on the next release of EngageBox for this assignment to support not only entire domain names but also parts of the specific URL. Just like how the URL Assignment works now.
Also, keep in mind that the Referrer discovery is not always 100% accurate. Some servers may use proxies that strip this information out and it can be easily forged.