A recent campaign conducted by Southwest Airlines is a perfect demonstration of mobile marketing meshing with web, social media and real-world engagement. It was devastatingly simple: a cocktail napkin - handed out to thousands of flyers every day - had a short code emblazoned across it, encouraging travellers to text their email address in order to sign up for news updates. It was a great example of marrying multiple user experiences to maximize engagement. By integrating two channels like this, you can grow your business exponentially, as each channel feeds off the other.