As anyone with a teenager knows, text messaging is quite popular among those in that age range.  And a recent Nielsen Mobile survey has concluded that not only has text messaging become the most popular form of communication using a cell phone, the group that texts the mosts (go figure) is in the 13 – 17 year range.The study determined that in the period from Q1 2006 – Q2 2008, the number of monthly calls per user has remained stable, at around 200.  But the number of text messages have skyrocketed