I get almost hundreds of friend requests every day from different social networking websites like Facebook, Orkut, Myspace etc and its quite annoying to handle these because you cannot easily stop these emails. Facebook by default sends you a email notification whenever there is any friend request or any other change in the facebook applications which you need to disable to stay away from this spam.
Facebook sends you a email whenever someone adds you as a friend and you have the approve to add them back by logging into your account. Normally all these email notifications are sent to you instantly whenever your friends find you on Facebook and when they add you on their network. Facebook shows you all the Requests in your account on your homepage where you can approve the requests and confirm them after which all these friends would be shown on your profile page which any other facebook member can find.
Here is a email you would recieve :
Pankaj added you as a friend on Facebook. We need to confirm that you know Pankaj in order for you to be friends on Facebook.
To confirm this friend request, follow the link below:
The Facebook Team
You can disable these friend requests by clicking on the link which comes at the end of your email from facebook which is linked to the ‘Email Notifications’ Facebook notifies you by email whenever actions are taken on Facebook that involve you. Each Facebook application has its own email notification settings. Click the name on the right to change the settings for that application. Facebooks tells that Even if you turn off all notifications, we may sometimes need to email you important notices about your account.