I have read the other threads about how the FB requests are only for Canvas apps, but maybe these answer are a bit old and I want to be sure this is current information, because on this page http://developers.facebook.com/docs/channels/ FB says:
If you have built a Canvas or Mobile Web application, Requests are a great way to enable users to invite their friends.
Difference between Canvas & mobile: Facebook canvas app vs Facebook mobile web app
Then, are requests just for Canvas even if they say that?