local function facebookListener(event)
    if (event.type == "session") then
        if (event.phase == "login") then
            sessionToken = event.token
             facebook.request( "me/invitable_friends")
        elseif (event.type == "request") then
       native.showAlert("Facebook listener", "request")
           if ( not event.isError ) then
            local responseJson = json.decode( event.response )
            native.showAlert("Me Request", responseJson)
        else
        native.showAlert("erro", "erro")
        end
        end
    end
end