We share these messages with each other too. On public forums, via email while we work or while we are out with our girlfriends. Most of them we laugh at how lame they are, but every once in a while a guy gets it and we oh an ah over it.
If you can consistently text a girl to make her smile, you are creating an anchor in her mind to an attraction for you. If you make this anchor solid, every time she sees your name or number on her little phone screen it triggers warm positive feelings about you. When you text a girl to make her smile, you are building and building the attraction, kind of like Pavlov's dog. She becomes conditioned to associate positive feelings towards you.
Don't fall into the trap of texting the same thing she hears from other guys over and over like "Good Morning Sexy or Beautiful". We get that all the time. Give her a pet name and use it. I have been called Scarlet as in O'hara and Goldilocks. Much more original than beautiful or sexy. When you text a girl to make her smile, be creative. Be cute and funny.
Texting girls is powerful in dating and flirting. It can build or kill the attraction. What's so great about it is you can actually think about and plan your reply. You can go so far as to send a text to manipulate her reply if you get really good at it. It is an art and a skill. If it does not come natural to you, take the time to learn this skill. It could change your dating and relationships by drastic measure.
Stop being just an ordinary guy and learn to stand out above the others. Learn how to push her buttons through a few little words in a text message. Know exactly how to text a girl to make her smile.