Right, let's have a go at looking at my own literacy events.
Here's a short exchange of txt messages between a myself and a friend. We're a similar age, work in the same place and have sons the same age. The messages are about arranging for the boys to get together. The literacy practice then is 'agreeing a date/making an apointment. The domain is home, not work.
I have a particular style with this friend: lots of in-joke references to our middle-class lifestyles and privileged children, 'pet' names only used in emails and txts ('Mr T')' some camping it up ('dearest fruit'). Banter (mock offensiveness) is a key aprt of how we communicate textually (less so in spoken English). It's not a style I replicate with other friends - it's part of a particular dynamic between us. I think this shared style evolved over time and involved initiation and uptake. A style got developed and stuck.