YES:
1. Legitimate issues with using the site.
2. Reasonable suggestions.
3. Links to free content that should be on the site.
4. Chill casual discussions about videos.
5. Being constructive and using common sense.

NO (will get you banned from the chat):
1. Being a dick towards people.
2. Being a dick towards the site/admin/policy.
3. Giving links that lead to nowhere/fake sites.
4. Asking for paid/premium content to be uploaded/provided for free.
5. Generally making a shitshow out of the chat.