I've decided that it doesn't matter where a comment is posted - it is the poster that matters. I thought at first that following posters rather than topics would mean that I would miss out on some discussions, but in fact the reverse seems to be true. If you find an interesting member, then the chances are that he will post in interesting threads that you may not have noticed.
I agree with that. I find it more effective and interesting to follow a user who has attracted you, rather than a topic that may seem interesting at first glance, but in the end it turns out to be a hangout for spammers. When I stumble upon a post that interested me, I begin to study the author and his range of interests. In general, users writing interesting and constructive posts, are not limited to one or two topics: they try to develop in different directions. Thus, I find for myself not only interesting discussions in principle, but also I get the opportunity to take part in a conversation with members of the forum who personally interested me. Thus, I have formed a circle of acquaintances I`m interested in communicating with regarding various topics. Perhaps in the future we`ll even become friends thanks to the bitcointalk forum. Search by an interesting user is more focused than thematic and gives much more useful results.