Reviews
As an influencer you can give reviews about brands with whom you have worked with, but brands can also give review about you. After finishing a campaign reviewing with stars is compulsory, but commenting in text is optional. After a brand has given a review about you, you cannot delete or alter it, it stays the same. This is information for other brands on what it's like to work with you - whether you are reliable, punctual etc. When you review a brand you can take their response time, their kindness and a lot of factors into account which helps other influencers when working with that specific brand.
References
You can get References after working with a brand. The advertiser can set this as an option in a campaign, this way a campaign can be publicly listed for you as a reference. Other brands can see these references on your profile - this is good because they can see how great it is to work with you. So you should always make sure that a brand is satisfied with your job and gives you good reference.
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Reviews also affect your content quality and response rate score!
Brands can see your received reviews on the website.
And the references from you previous works.