Anonymous sharing with up-voting and down-voting.
Or create a new room. You have two options here.
A default room allows anyone with the room link to make posts and everyone with the room link can see all posts made.
For an AMA room only the creator of the room (or anyone with the room secret) can see all posts and can make comments on them. Everyone else can only make posts and view their own posts and comments made on them.
Or create a poll