Problem: Cannot have too many pinned conversations because they take up space at top and other conversations become hidden from initial view by being pushed downward.

Solution: Be able to double tap or push an arrow that compacts the pinned chat into just the bubble and there could be a row of bubbles at the top with the pinned chats (like 4 per row). To access, you click the bubble and you go to the chat. Then you can have many different pinned conversations without them crowding out the other conversations below.