Nick Douglas urges you to at least use an exclamation mark
                                
                                
                                    (Newser) -
                                    Think "OK" and "Yes" are good responses in a text? If so, please use an exclamation point to sound more positive—at least according to freelance writer Nick Douglas. "Otherwise you might sound passive aggressive, dismissive, or angry," he writes at  Lifehacker . "There's a...