Question: Can I legally use the information I collect from users of my website for marketing research and to analyse demographics?
Answer:Yes. But depending on the nature of your business you are also likely to need to comply with the Privacy Act 1988 (Cth) which involves disclosing this activity to the users of your site in your Privacy Policy. You should also check the requirements of any analytics systems you are using to analyse demographics on your site, for example, Google analytics.