For each task, there is a page for posting help questions and a page for posting comments. Neither of these pages permit posting solutions, though. Usually when I complete a task, I like to look at the official solution to see how it is different. In some situations, I don't understand the official solution at all. But there's nowhere I can ask for a discussion on it. I think it would be useful to have a page where we can talk about the solution. It would also be useful for users to compare their solutions and find the most efficient one. Seems like it would help learning for everyone. Maybe make the page only available if the task is marked as completed?