Text Slang

Along with revolutionising the way that we communicate with each other, texting has also had a huge impact on the language that we use when we communicate. Over the years, 'texters' have developed their own unique dialect of English, that uses both numbers and letters when typing certain words. These words started out simply as abbreviations for longer words that people simply weren't bothered to type out. Words like '2moro', 'L8R' and 'GR8'. These were simply invented to save time.

Eventually, texters became even more lazy, and began to develop acronyms for commonly used phrases. Be Right Back became BRB. Talk To You Later became TTYL. Oh My God became OMG. And who could forget LOL. Most of these phrases were used extremely commonly not only in texting, but all over the internet, in chat rooms, social media and email.
But in more recent years, there's been a shift in the usage of texting slang. Acronyms like BFF, TTYL, IDK and especially LOL, have escaped our computer screens and found there way into normal everyday conversation. Personally, I think it's incredibly annoying, but I have heard people in real life conversation, replacing natural laughter with "LOLOLOLOLOL". Other words and acronyms that are no longer confined to text messages include noob, FTW and JK. It's only a matter of time before it becomes a social norm to say "ROFLLMAO" out loud (Laughing Out Loud Rolling On The Floor Laughing My A** Off)  

Sources:

http://www.netlingo.com/top50/popular-text-terms.php