It's an interesting approach at controlling the signal to noise ratio. Unfortunately, my experiments with that sort of thing over at reddit show me that blocking some people and "following" others isn't all that effective. People are dynamic. They have hot days and cold days, interesting days and not so interesting days. I've started looking into machine learning to see if I can train it to recognize what I consider a "good" post based on the word content of the post. I haven't gotten it to work yet. :P