AQA English Language Spoken Language StudyWatch
reduplication of letters (e.g. I'm soooooo bored)
taboo language/asterisks (e.g. wtf/f***)
acronyms (e.g. lol)
As I switched schools halfway through the term I was studying spoken language, I don't remember all of it, but I know that the controlled assessment involved an introduction regarding how text speak affects society before launching into what you found when you annotate your informal text (along with a formal, politely written one), explaining things such as adjacency pairs (speaking to one person who replies to you). In my old class, we had to study an article written by John Humphrys who criticised texting because it was teaching young people to be lazy with their grammar.
At first, spoken language can be quite a lot to get your head around, but it makes sense over time. Good luck!