Does facebook allert everyone when i add a new friend

No, Facebook does not automatically alert all of your friends when you add a new friend. When you add a new friend, the notification is only sent to the person you are adding as a friend, and it is not broadcast to all of your existing friends.

When you add a new friend, the notification is typically sent to the person's email address or mobile phone number, depending on their Facebook settings. The notification may also appear in their Facebook notifications tab, if they have notifications enabled.

However, if you want to share the news of your new friend with your existing friends, you can do so by posting a status update or sending a message to your friends.