We have already implemented categories-based home page in our app https://oneplace.media where customized tags are selected during registration step or in the user profile.

This is what the tags setup page looks like, quite similar to what you suggested:

Trending posts with favorite tags are then aggregated to the users' home screen.

Searching multiple tags is an idea we also like but this needs to be supported by relevant blockchain API and not easy to realize just on the front-end side.