Piano Analytics prioritizes the campaign tracking parameters. When a visit starts from a link tagged with campaign parameters (at_ or utm_), the campaign becomes the source of the visit, even if the first event also has a referrer.
Links without campaign parameters are given an organic source based on the referrer. For example, a visitor who clicks a tagged link in your newsletter is counted under your email campaign. A visitor who clicks an untagged link to the same article on a partner site is counted under Referrer sites.
Order of traffic sources
To see all your organization's traffic sources, go to Data Management > Sources > Traffic sources. Sources are listed in priority order, with Marketing first.
You can drag a source to change its position in the list. Referrer sites is always last and can't be moved: it collects visits that have a referrer but don't match any other source. If you hover over its handle, the message "Reorder Prohibited" appears.
