1. Non-factual or overly factual reviews
Facts are important in a review. When you’re writing your own reviews, staying factual can protect you from a lawsuit. And factual tips are useful for everyone.
2. Similar reviews
Similarities in the reviews across several websites means that reviews are fake.
3. New reviewers
Someone who’s reviewed only a few items from the same manufacturer. It helps, too, if some of those reviews have factual criticisms.
4. Few reviews
Every review becomes suspicious, especially if it appears only in an out-of-the-way blog or website.