Students are using texting as a major method of their day to day communications, and because they are writing on compact and small keyboards they invented these acronyms to get their ideas across with the least typing time  possible. There is nothing wrong with this except when it spells over  into the formal writing territory then it becomes a problem. You might think that by just making them aware of the difference between texting and formal writing will do the job, but what about their spelling and grammar. Studies have shown

"For the last five centuries, ever since Gutenberg made reading a popular pursuit, the linear, literary mind has been at the center of art, science, and society. As supple as it is subtle, it's been the imaginative mind of the Renaissance, the rational mind of the Enlightenment, the inventive mind of the Industrial Revolution, even the subversive mind on Modernism. It may soon be yesterday's mind."Because our brains can no longer think beyond a tweet, we can't write well. And we can't read well either. The idea of reading—let alone writing—War and Peace, Bleak House, or Absalom, Absalom! is fading into an impossible dream.