It is illegal to give immigration advise if you are not a licensed advisor. But what is advise?
This is a link to NZI's website which gives some guidlines as to what is advise.
That is great, its a bit of a fine line most of the time and this link clears it up nicely!
Basically if you are (a) sharing your personal experience (b) not providing advice based on another person's particular circumstances and (c) sharing information that is otherwise freely and publicly available then you are in the clear.
Going on two years and still enjoying the ride.