John Wanamaker is often credited with the saying, "Half of my marketing budget is wasted, the trouble is, I don't know which half." That was over 100 years ago, and the good news is we've come a long way since then thanks to modern tools and technology. The bad news is, for leaders of many small and medium-sized businesses, while you're focused on running the operations of your business, your marketing efforts can remain a bit of a guessing game. The Difficulty of Adapting to Marketing Changes The world of marketing changes rapidly. Between the launch of new social channels,…