Yes, drivers can invite friends or family on a Poparide trip, as long as they mention in the trip description that other passengers who are not booked on Poparide will be in the car. This helps ensure transparency and lets passengers know who will share the ride.
For more information, see posting a trip here.
On the other hand, passengers can only invite friends or family if they book seats for each additional person that wants to join the trip. Every passenger travelling must have their own seat booked to ensure fair contributions and space for all.
For more details, check out booking a trip here.