2b |! 2b, < = ?
With such a rich history of inventive writing and puns, it seemed bizarre to me that the idea of writing in txtspk would be a new one. I found a brief degree of truncation in telegram style, dating back 120 years, but I can't find any further history of people using the phonetic sounds of punctuation or numbers for humour, wit or any other reason.
Are cute pieces of wit such as '22' (tutu), ': imflam8ion' and so on unique to recent writers, or do they have a longer running history?
Edit: I can't believe I forgot l33tsp34k as @Kathryn points out in an answer below, but the original intent of my question was to find examples of these shortenings much older than the past few decades, if they exist.