I don't really understand whats the question want me to research.
Like question 2, what is barriers mean in business?
For question 3, is it mean how the platform earn their money or what?
For question 4, is it mean how people know that platform..like ads or ...idk..not sure
For question 5, really not sure what is it mean...
Research and outline the distribution platforms available to you in your discipline:
1. What audiences are reached through these platforms?
2. What are the barriers to using these platforms?
3. What costs are involved?
4. How are the platforms perceived by audiences?
5. What pricing is available for these platforms?
6. How do the platforms effect production?