In the Organisation/User specific channel view or in the "All Conversation" channel view in the left menu,
by default, the favourite channel should show at the top and then the other channels based on a "frecency" (frequency + recent view) algorithm similar to #2.

• Mentioned rooms
• Favourite rooms
• Last accessed room (for org./user specific view) (change based on human psychology)
  • 6 Last accessed rooms (for All Conversation view)
• Others based on frecency algo.