An April 25 New York Times article points out:
As e-mail messages, text messages and social network postings become nearly ubiquitous in the lives of teenagers, the informality of electronic communications is seeping into their schoolwork, a new study says.
Nearly two-thirds of 700 students surveyed said their e-communication style sometimes bled into school assignments, according to the study by the Pew Internet & American Life Project, in partnership with the College Board’s National Commission on Writing. About half said they sometimes omitted proper punctuation and capitalization in schoolwork. A quarter said they had used emoticons like smiley faces. About a third said they had used text shortcuts like “LOL” for “laugh out loud.”