By John Mattingly As FACEbook proves itself worthy of being another F-word, Inner Old Man has squeezed out a new B-word: BUTbook, an emergent social media platform with but one rule: Each message and response must end in the word BUT. By BUT-ending sentences, and BUT-splicing paragraphs, a conversation can be reversed, enhanced, or surprised and perhaps a one-way diatribe can even be BUTTED into a two-way argument. Though only a three-letter word, BUT is big. Who among us has not heard, and felt, the power of a well placed BUT: “You’re really doing the right thing, BUT the thing ...