Using the iOS Built-In Twitter Feature

corona_twitter.lua

local function tweetCallback( event )
   if ( event.action == "cancelled" ) then
      print( "User cancelled" )
   else
      print( "Thanks for the tweet!" )
   end
end

local options = {
   message = "Hello Twitter world!",
   listener = tweetCallback,
   url = { "http://coronalabs.com", "http://apple.com" }
}
native.showPopup( "twitter", options )