Google Reviewed By Snippet
Briefly

Sachin Patel recently discovered that Google Search now displays the author of reviews directly in the search results snippet, which enhances transparency and user trust.
This new 'reviewed by' rich result element is reminiscent of the existing 'uploaded by' snippet features, aiming to provide users with more context about the reviews they encounter.
While it's suspected that this feature may use review structured data, it's not confirmed that this is the only source for the information displayed.
The introduction of authorship in search results could influence user engagement, leading viewers to place more trust in the reviews based on the credibility of the reviewer.
Read at Search Engine Roundtable
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