May I point out the fact that I can't help but be a bit overwhelmed by the notion of following people as opposed to topics? Thing is, people may have a lot of different interests, some of which may align with mine while others may not. Also there's a whole lot more people out there than there are topics, so following only a specific set of users may be very limiting, while following every person whose comment you found relevant or interesting can become a real mess and be very overwhelming. I think the hashtag system should be expanded on - sort of like subreddits, but dynamic, meaning there's no particular "section" reserved for them, people just tag them whenever they make posts, as they do now, but this allows for an easier organization of your interests and feeds.