Public Chats on Viber are where you can follow your favorite celebrity, community or else, and see what they say and like them. To join a public chat on Viber on Android, do as follows:
1. Open Viber application on your Android device2. Tap the 4th tab on the top to enter the Public Chat menu3. Tap the search icon on the bottom left4. There you have 2 options to find your favorite public chat: Use the Search box or find it through the suggestions5. Once you find your Public chat to join, tap the Follow this public chat button and it automatically adds to your list6. For now, you are only allowed to like the posts in the public chats by just tapping the heart icon next to each post