Code below.
local function adListener_FB( event )
    – Successful initialization of the Facebook Audience Network
    if ( event.phase == “init” ) then
        print( "Facebook Audience Network event: initialization successful with placementID: " … placementID )
        fbAudienceNetwork.load( “banner”, placementID, “BANNER_HEIGHT_50” )
    – An ad loaded successfully
    elseif ( event.phase == “loaded” ) then  – The ad was successfully loaded
        print( event.type )
        print( event.placementId )
        – Show the ad
        fbAudienceNetwork.show( event.type, event.placementId, {y = screenH - 50}) – { yAlign=“bottom” } )
        transition.to (tabBar, { time=200, y = screenH - 75} )
print(“Facebook Ad loaded Successfully.”)
    elseif ( event.phase == “failed” ) then  – The ad failed to load
        print( event.type )
        print( event.placementId )
        print( event.isError )
        print( event.response )
        – show admob ad
        fbAudienceNetwork.hide( placementID )
        adType = “admob”
        showAd();
    elseif ( event.phase == “clicked” ) then  – The ad was clicked/tapped
        print( event.type )
        print( event.placementId )
    elseif ( event.phase == “closed” ) then  – The ad was closed (interstitial ads only)
        print( event.type )
        print( event.placementId )
    end
end
function initAds ()
– for Facebook Audience Network
if isAndroid then 
placementID = FBbannerPlacementID_android
else 
placementID = FBbannerPlacementID_iOS
end
local deviceHashID_junhyuniPhone6s = “4f1613XXXXXXXXXXXee092b91”
fbAudienceNetwork.init( adListener_FB ) 
end
current device console message
I/Corona  ( 1206): Facebook Audience Network event: initialization successful with placementID: 58084XXXXXXXXXX8729981
I/Corona  ( 1206): banner
I/Corona  ( 1206): 580840XXXXXXXXXXXXX8729981
I/Corona  ( 1206): Facebook Ad loaded Successfully.