Here are some simple rules to get you started on legal, ethical influencer-based advertising!
If the Endorser hasn’t actually tried the product or used it in the way they say, they shouldn’t talk about their experience with the product
For sponsored products, the Endorser has to disclose their relationship with the marketer/brand. Hashtags like #sponsoredpost, or an explicit disclosure like This is a sponsored post from my friends @brandname, but the opinions are mine and I love this product! are also acceptable