@Kate2202 You're not allowed to use Airbnb's booking system to seed your listing with fake reviews from friends. And it doesn't really make sense to make an actual friend pay Airbnb's service fees to stay in your house when you already know each other.
But Airbnb doesn't keep a record of your social connections, so if one of them legitimately wants to pay for a normal booking, there's no reason they can't do so on the platform. The exception would be if their profile location is in your local area and the algorithm flags them as a party risk.