From Penn State Live:
“Overall, there is evidence of a decline in grammar scores based on the number of adaptations in sent text messages, controlling for age and grade,” Cingel said.
Not only did frequent texting negatively predict the test results, but both sending and receiving text adaptations were associated with how poorly they performed on the test, according to Sundar.
“In other words, if you send your kid a lot of texts with word adaptations, then he or she will probably imitate it,” Sundar said. “These adaptations could affect their off-line language skills that are important to language development and grammar skills, as well.”
More here.