TTYL

Today I heard a student in the corridor say to her friend TTYL. She actually said the letters. As though it was an oral text. To be honest, I had to think about what that might mean. Talk To You Later. Of course. And it's not the first time I have heard this. On the train, two girls were talking and one said LOL. And she didn't even laugh out loud. Her friend had said something funny and the response was an unlaughed LOL. I don't understand. Is it because I am 40? Why are they speaking text language? When did this happen? OMG, I can't believe it.