Why not... ask your users about their interests and demographics?
I think the problem is the analytics mindset. That you're entitled to have that information without a user actually providing it to you. Ask people. No, not all of them will answer, and that's okay.
As a user, if you try to gather information about me without my consent I will do everything in my power to stop you, but if you ask me instead, I will help you out — probably with a smile on my face.
I think the problem is the analytics mindset. That you're entitled to have that information without a user actually providing it to you. Ask people. No, not all of them will answer, and that's okay.