How to design Notification Table for Social Networking Site

https://laravel.com/docs/5.8/notifications#database-notifications

Laravel uses a single table for all of your notifications. You can create this table by executing the php artisan notifications:table command and then php artisan migrate. Then you can use php artisan make:notification YourNotificationClassName to create the notifications you need (post like, friend request etc). Once you have your notifications ready, you can notify your users with $user->notify(new YourNotificationClassName()). This will create a record on the notifications table. Note that the data column on this table will hold an array you can define on the toArray method of every notification. Use this if you need to store something like a friend request text or something.

You can iterate through a user's notifications with:

foreach ($user->notifications as $notification) {
    // do your thing
}

or

foreach ($user->unreadNotifications as $notification) {
    // do your thing
}

You can count them:

$user->notifications->count();
$user->unreadNotifications->count();

And you can mark them as read or delete them.

@ravasaurio is there any example to broadcast notification via fcm?