Thanks for posting your answer. I have some feedback on this:
- User groups / personas should be exclusive. e.g. students, young professionals, families with kids. Some people might belong to more than one group but at a high level, they should be exclusive.
- Each use case should reflect a need. The listed use cases need further explanation. For example, why are "joining subgroups" or "asking questions" important use cases?
- Keep each solution description brief and ensure that they each reflect a unique feature. Check out the examples submitted by Ali or prisingh above as reference.
- I would list at least 5 solutions for product design questions to ensure that you can pick a minimum of 3 as the key features of your MVP
Hope you find my feedback useful.