I agree that the shorthand started with texting on traditional cell phones. It made (or for those of use who still have phones without a keyboard makes!) it quicker and easier. In additional there was a time when texts were charged by size rather than by message or unlimited plans. The less characters you used the cheaper. As time has gone on, it has just become habit and is still easier and quicker. However, I do think that laziness plays a part in it, because while shorthand is acceptable in some situations, it is totally inappropriate in others. If you were to use text shorthand in an assignment turned in my class, you would lose credit. If you were to use text shorthand in an email to me (not personal, but student-teache or professional) I would be offended and with students expect it to be rewritten in a more formal way, because the relationship is formal. I also agree with the post that says that language changes over time making shorthand just a new form of slang. However as has always been the case there are times, places, and relationships in which slang or informal language is ok, and there are times, places, and relationships where formal language is necessary.