When users invite friends to my Facebook application with e.g. fb:multi-friend-selector, how can the application get a list of friends (uids) the user just invited? My application has internal "groups" and I need to connect the invites to these groups and therefore have this possibility.
We all know Facebook's documentation isn't very verbose and I've spent some considerable time researching this to no avail yet. Creative ideas to solve my problem are also appreciated.