Best way to keep residents informed?

I’ve been on our SC in NSW for 3 years or so and in a complex of over 150 apartments we have lots of things going on. We want and need to give updates and information to lot owners in our complex on an ongoing basis not just via minutes of SC meetings. 

We would appreciate advice about choosing the right platform or forum for this. We want to make our complex feel like a community so we’d want to provide general information like council services or updates on NBN for instance. Or updates to relevant laws and regulations that owners wouldn’t necessarily find out about otherwise. 

We acknowledge that not all owners will be active on social media, but printed newsletters and emails seem outdated. Perhaps a password accessed website?

We’d appreciate any feedback from others who have tried this and anything that we should be wary of? eg. Are there privacy issues? Anything else that we need to be cognisant of?