Well, another Mobile World Congress is in the books, and as usual it was exciting, exhausting, educational, entertaining, and expansive. It’s interesting to see how the ad tech space has grown: five years ago, the whole mobile ad tech contingent was squeezed into the App Planet hall, with tiny booths and little name recognition. Now the companies we’ve grown up with all have better spots, bigger booths, and much more swagger. There are more and more “mobile marketing platforms,” and “audiences” is practically the word of the year. Along with that maturation, the change in tone over the years has…..