Steemit is great for some reasons, not only can you get paid for your (good) contents, it's also on a blockchain and therefore free of regulations.
But while it is a great platform for informational content it's not a real social network like Facebook - and to keep earning money you have to produce continually good content (therefore I would say it's wrong to call it passive income)
That's where Xenzuu.com might come in, it's not a blockchain project, but from a company that tries to make profit. But part of the ad rewards will be given as rewards for all members based on how many people they have invited (or just have been added to their accounts downline.)
The project is in beta still but looks like a promising real social media alternative
I can't say how much you will be able to earn with it by just using the platform, but if you want to try it out it would be best to be among the first users in beta Phase - to get a big downline fast.
As I understand It Steemit is best for getting money for good content, Xenzuu is getting money for beeing there.
I will try it out, it might be lucrative - and if not I at least have tried it out - what do you think?
Code (in beta necessary to register/ with 2$ start balance): F8ZBEEBN