John Legere is not the type of executive that wears a suit and tie–at least, not unless it's magenta in color. The CEO of T-Mobile, one of the largest telecommunications companies in the U.S., is anything but your typical executive. He has cultivated 6.49 million followers on Twitter, over 75,000 followers on Instagram, and over 390,000 followers on Facebook.    John Legere is Mr. Magenta   If you do not recognize the name John Legere, you may be more familiar with his nickname: Mr. Magenta. It is a catchy phrase that perfectly describes Legere. On social media, he is often wearing the color, whether it is a t-shirt, sneakers, or even magenta hair for #NationalHairDay. This color choice is no accident as it is the same iconic magenta of T-Mobile's logo. It is a smart and subtle way of indirectly calling attention to the...