How do your customers play role in growing your business network?

Thanks 

As you mentioned loyal customer is a walking advertisement , that is the role

Regards  

Thanks for invitation, 

agree with the answer of Mr. Omar Saad.

Thank you very much for inviting me. I agree with the answers of our experts....................

They provide you feedback. The are your walking advertisement and they spread good word of mouth for you and vice versa. 

Thank you. I agree with Mr. Omar Saad Ibrahem Alhamadani & following new answer.