Muting and Unmuting Notifications
Notifications for individual and group chats are always on by default. You can mute chats by going to the 'i' icon and turning the "mute notifications" to on.
Social post notifications
Notifications for social posts are a little different. You receive a notification when a social post is first created and shared with you. Notifications for comments are off by default to avoid excessive alerts. Use the same toggle in the information menu to unmute notifications for comments.