To minimize the amount of traffic that falls within the "no referrer" category, you can add special query parameters including UTM tags to your links.
Whenever you post a link in social media or send it to someone via email, you can choose to add a special query parameter to the link. When for instance
?ref=<value> query parameter is present, Plausible Analytics will show it as the referral source.
utm_campaign query parameters are all valid and supported.
For example, here's what you can do when you want to send a newsletter to your subscribers. If you simply link to your site with
yourdomain.com, anyone who clicks on it would fall within the "no referrer" category.
But if you link to
yourdomain.com?ref=Newsletter anyone who clicks on that will show "Newsletter" as the referrer source. This will allow you to see how many people have clicked on your link in the newsletter.
Here are examples of links with the different query parameters that are supported by Plausible Analytics:
For any clicks on any of the above links, "Newsletter" would be listed as a referral source in your Plausible Analytics dashboard.
You can also go a bit deeper and track your links in more detail:
For any clicks on the above link, "Newsletter" would be listed as a referral source in your Plausible Analytics dashboard, "Email" would be listed as the medium and "NovemberNewsletter" would be listed as the campaign.
It is a good practice to tag your links where the referrer header is not sent. Emails, newsletters, chat, messaging applications, social media, paid advertising campaigns and so on.
When a query parameter is present in the link it takes priority. When someone lands on your website without the special query parameter defined, we fall back to the referrer header.
Note that the referral sources including query parameters are counted only when they start a new session on your site.