When a learner gets the opportunity to send an exercise for correction (at the end of a lesson, or from the Social section), it can either be sent to the Community, or to specific friends they have in their list of friends.
As a learner, you can send your exercise, and it will be corrected by one or multiple learners who claimed to speak the language as a native or advanced level.
You will also receive exercise to correct for other learners, and you can select some directly from the Social section.
This is the amazing advantage of learning with busuu!
Native and advanced speakers help each other practice and progress!