New research designed to understand the effect of text messaging on language found that texting has a negative impact on people's linguistic ability to interpret and accept words.

According to ScienceDaily, a University of Calgary grad student named Joan Lee surveyed undergrads about how often they texted, and how often they read print media. They were then given a list of real and fake words.  The survey found that the frequent texters rejected more of the words than the nerdy readers did. The authors noted:
Our assumption about text messaging is that it encourages unconstrained language. But the study found this to be a myth. The people who accepted more words did so because they were better able to interpret the meaning of the word, or tolerate the word, even if they didn't recognize the word. Students who reported texting more rejected more words instead of acknowledging them as possible words.
This might be because even though people text a lot of misspellings and acronyms, they're not as interested in using big words that would help expand their vocabulary.  So basically, texting is turning today's youth into the kind of anti-intellectual jerks who yell at you to stop using "big words." Excellent...