build.settings

settings = {

   plugins =
   {
      ["facebook"] =
      {
         publisherId = "com.coronalabs"
      },
   },
}

main.lua

local widget = require( "widget" )

local function onComplete( event )
   print( "event.name:", event.name )
   print( "event.type:", event.type )

   if ( event.data ) then
      -- event.data is a table of friends returned.
      -- event.data[1] will be the first friend returned.
      -- Each friend will have a list of fields returned like:
      ----- event.data[1].firstName
      ----- event.data[1].fullName
      ----- event.data[1].lastName
      ----- event.data[1].id
   end
end

local facebook = require( "facebook" )
-- Listener for "fbconnect" events
local function listener( event )
   if ( "session" == event.type ) then
      -- Upon successful login, request list of friends
      if ( "login" == event.phase ) then
         -- Show the friends picker
         facebook.showDialog( "friends", onComplete )
      end
   elseif ( "dialog" == event.type ) then
      print( event.response )
   end
end
local FBAppID = "XXXXXXXXXXX"  -- Facebook App ID from build.settings, without the "fb" prefix.
facebook.login( FBAppID, listener, { "publish_actions" } )

local function showDialog( event )
   if ( event.phase == "ended" ) then
      facebook.showDialog( "friends", onComplete )
   end
   return true
end

local button = widget.newButton{
   label = "Pick Friends",
   onEvent = showDialog,
}
button.x = display.contentCenterX
button.y = display.contentCenterY