Question: A new user discovers a website for the first time by clicking a sponsored link on a search engine results page. One week later, the same user returns to the site by clicking a link from an email campaign. In a report analyzing this second session, what will the dimension First user source display?
- Organic Search
- Paid Search
- (not set)
Explanation
First user source reflects the traffic source that first acquired the user. It is user-scoped, so it does not change when the same user returns through a different channel later. The later email visit can appear in session-scoped acquisition dimensions, but it does not overwrite the original first-user value. This distinction helps separate first-time acquisition from later return-session behavior.
Why the other options are incorrect
(not set) is incorrect because the original acquisition source is known.
Email is incorrect because it describes the later return session, not the first user acquisition source.
Organic Search is incorrect because the original search visit came from a paid result, not an unpaid result.
Source for verification
https://support.google.com/analytics/answer/12922540
https://support.google.com/analytics/answer/11080067
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