A very simple tool to accept all Facebook friend requests and send friend requests. Using this tool, one can quickly build a large friend list, up to the maximum of 5000. Originally, this was written as a tool to help study the "underside" of Facebook.
Browse to the url https://www.facebook.com/?sk=ff, and launch the javascript console by using inspect element. Enter the friendify code.
Integrate this into a plugin for Chrome or Firefox or as a stand alone app.