Facebook gave users fair warning ahead of a recent change that requires people to install a separate iPhone application if they want to keep using Facebook’s messaging feature on their iPhones, but there is still plenty of outrage. So much so, in fact, that the Facebook Messenger app for iOS now has a 1-star average rating in the App Store out of spite. But if you would rather not use a dedicated app to chat with your Facebook friends, don’t fret: A simple trick will let you keep using the main Facebook app for the iPhone to send and receive messages. In a recent post, The Guardian noted that there is an easy loophole that allows users to continue using the