How do you allow your Facebook Connected users to invite their Facebook friends to your website?
All previous answers on SO are outdated referencing that it was previously possible with fb:multi-friend-selector, but since FBML will soon be deprecated, its not an option worth entertaining.
The only option I see now is to create a canvas app that redirects to my website but I would assume this is not permissible since only Canvas or Mobile apps can use the Requests dialog. I could build my own modal by getting the users friends and then sending them a message directly--also probably not permissible.
Nikolay did a fair assessment here, but was not provided a solid answer. Is Facebook locking down multiple friend invites and leaving only newsfeed posts and likes to webpages?