In Hong Kong, several whatsapp groups, LINE chat and a closed Facebook group have evolved. It's great that the community has spread out to more media, but the downside is that where TMC/HK forums used to be the focus of what was going on, one now have to track many different apps/sites to get the latest news.
Whatsapp is great for more urgent and fluctuating issues like charging spots blocked, how long line at the supercharger and such, but because of it's ease of use on mobile devices, even more in-depth discussions like styling, wrapping, charging standards and much more, is being discussed.
It's harder to track and find that information again, so it's a bit sad the TMC forums have died down so much.
I suggest you avoid the same trap: Be sure to "police" your chat groups to make subjects that are worth keeping for later reference, are directed to the forums.
Having said all that I would like to point out a feature of Whatsapp that allows you to email the entire history of the chat - for instance to yourself. You can then use a text editor and it's search function to look for certain subjects. Just click the header of the Whatsapp group, go down to the bottom and find Email chat.
Hong Kong now presumably have 1,000+ Model S on the streets, how is it going for Australia - any guess of sales figures?