Have you ever found yourself mourning the days when your teens actually talked on their phones instead of constantly tap, tapping on their tiny keypads? (And having such exciting conversations, too: “Wut up?” “Nm.U?” “NM.”) More than 75 billion text messages are sent each month, and teens 13 to 17 are the biggest texters of all. They average  2,272 text messages a month, according to the Nielsen company -- that's almost 77 messages a day. So, what’s the impact on our kids?