Earlier today Facebook rolled out the new mutli-friend selector, a feature we first highlighted a couple weeks ago. As we highlighted before, “The benefit developers is that any new users that register for Facebook will have the application from which their friend invited them to the site, bookmarked by default.”

While in many countries, the number of users that a friend has who’s not on Facebook is relatively low, this could definitely have a dramatic impact on countries, like Indonesia, where user growth is only beginning. Facebook provided more details this afternoon about the feature:

The new two-stage user interface makes it even easier for users to invite both their existing Facebook friends and their address book contacts to use your application. Despite this two-stage process, a single request will be sent to the form endpoint at the end of the flow. This request will contain the user IDs of invited Facebook friends as well as new Facebook user IDs for those address book contacts the user invited.

Fortunately if these updates damage applications, the developers can disable “disable the second stage of the flow so no address book contacts are invited.” Ultimately this feature should benefit both the developers and Facebook!

A quick reminder: today is the last day for the early bird on our upcoming Social Developer Summit.