There's a notification you can get on Face Book which tells you where they are . It's called Dorsal Shark Alerts. There's also another one called "Shark Alerts"
I wouldn't suggest following them though as it starts to freak you out a bit. .There was even a big bull shark spotted in Bonville creek at Sawtell today which is where I paddle in the holidays. Normally a shallow entry to the sea. This one appears to have entered and been living there for a while.

I've seen quite a few sharks (whalers, whites and grey nurse) while freediving-spear fishing, and can say it's not the ones you see that are generally a problem. If they really wanted you, you'd have no chance while in the water.

In Ballina you just watch the chopper for real-time updates. If it does one circuit near you then you pay attention. When it does two and some guy is waving at you, it's about then when you start wondering why you haven't seen flipper for a while.