The 'Add as friend' module provides a quick way for users who view your page to invite you to become their friend.
When you add this module to a page, it will display a line of text and a button.
You can set the text to display, which will be presented based on the user's status:
Non-friends – set the text that people who are not yet your friends will see when they view this module.
Friends – set the text that people who are already your friends will see when they view this module.
Allow replication - allow other users to replicate this module so that it appears on their network. When replicated users will be able to become friends with the user who published the module.