Hi friend. On the audio of the video I did not find any problem, it works correctly on my computer. With respect to Facebook, it is done through the monetization of your fanpage on Facebook (you can also monetize your normal profile, through platforms that I will put later on videos or blogs). To monetize your fanpage you need to fulfill the following requirements: have at least 10k of followers, and at least 1000 minutes of playback in the last 30 days. To see how the requirements go, you must enter the fanpage settings and see the monetization feature. Making viral posts can be charged through sponsors (each user must reach an agreement with sponsors) who pay to advertise their products. Later I will make a well-explained blog on how to generate money with Facebook. I hope it has served you, greetings.