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Yes, there seems to have been quite a run of them since hitting 500. A mixture of the usual random spots plus a lot of new deliveries happening in the past few weeks. And, especially aided by a currently prolific contributor.
As the Model S becomes more common I would expect that social media spots will start to reduce. I mean, it's not like people Instagram every Prius they see and the 'exotic car' Facebook pages will eventually stop considering a Model S exotic. In fact, the Sydney and Melbourne pages don't already.
On the other hand, more owners means more spotters picking up the slack.
Another factor is that there were a lot of orders just before the last price rise took effect in November (I was one of them). These are all being delivered late Feb to early March.