Wed, 08/25/2010 – 02:15 by Nielsen offers data culled from a year of looking at US mobile subscriber phone bills and other sources. It shows the places and populations who talk and text the most by state and ethnic group. There are geographic differences in terms of voice minutes and texts per month. And it’s a bit of a non-surprise that teens text way more (emphasis on the word “way”) than anyone else — more than twice as many texts per month than those in the 18-24 age bracket. Residents of the south talk more than others, while the states with the greatest volume of texts are distributed: The chart above confirms (again) that the most effective way to market to teens may be SMS-based.