Sort:  

How so?

A feature that allows people to form or join a community of their interest. On Reddit, there are various sub-reddit for different subject and interest. It's like a group for specific subjects

That is what the tags kind of do. I am not sure if what you propose will break things down too much.

It will, let say someone who is joining thread for the first time, there will be option to choose what he wants to see on his feeds or Wall. In that case there will be 2 feeds, one will be general while the other will be personal feeds.