We normally use facebook multi-friend selector to invite our friends. Some applications also tracked the user ids to whom a user sent invitation. That is very easy to track because when we send invitation facebook will pass ids parameter that contains the invitation receiver ids.
But yesterday I noticed facebook changed their invitation functionality. That is after I send invitation facebook shows me a new email invite box. That wouldn’t be a matter to me, but I noticed the tracking records become duplicate. Here I’m describing the way to solve this problem. Read Full Article