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Simply copy and paste that into the address bar when you have the friend selector window open. I have a video to show you exactly what I mean here:
So now you know how to select all friends on Facebook for an event, the easy way. You can use it to invite friends to your facebook groups, pages, anywhere the friend picker window shows up!
As of 3-29-2011 this method works. If you can’t get it to work on your end, try again. I use this method myself so if it stops working I’ll update the code.
Can’t get it to work? Try right clicking in different places in the select friends window. I found right clicking on a photo worked for me. Also note that it can take a long time for your browser to select them all, and after submitting it appears to do nothing when it actually is.
4-13-2011 This method is not currently working. However a Firefox Plugin does this very well. I will post an update when I’ve got a new code figured out ;-)