He gave two ways he would like to more finely control content: 1. subtopics (your example) where he was interested in Android but not selfie apps 2. by publis

He gave two ways he would like to more finely control content: 1. subtopics (your example) where he was interested in Android but not selfie apps 2. by publisher: "I might dislike an article because the publisher is low quality" I was replying with a solution to problem #2 only.