1) Are there moderator or admin roles? For example, if I switched to this platform, can I give some members in my community special access to certain announcement categories or have them identified in any way when they message a post? 2) Can I also, as an admin, set which announcements get a notification to group? 3) Is there a way to let members get classroom access but not community access? 4) Can you do email sequences to members like drip email campaigns?