The Everyone dropdown will include a customize link that opens a dialog similar to Facebook's for customizing audience locations and languages, except these fields will allow multiple selections rather than single text inputs. Locations and languages in the dialog will be sorted alphabetically by name.

1. Selecting Everyone dropdown (use combobutton, look at the Help link in the menu for example)
will show customize link, clicking on which will popup the dialog which looks similar to the
facebook dialog. This is similar to how it is on Facebook.
Except, location and language will be multiselect, instead of typeahead boxes.
Country, language should be sorted by name.