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Intriguing question. In short yes there is a benefit - in so far as the three-panel reviews that appear are often manip[ulated by likes. So your liking a positive review may push a negative review off the SERP. However, should your staff write false reviews, 100% not, that would not good from an objective perspective?  In Australia it would be a disaster for staff and the business moral, effectively it is imposing your views on your staff on possibly private gmail assets and asking them to publish your views.

Thanks Christy! I appreciate the endorsement!