This is exactly how I've been feeling recently. I'm not entirely unsociable, but I'm happiest when pursuing my interests. From time to time, I find one or two people with a similar level of knowledge to mine to talk to, but no long term friends of this kind. Sharing stuff on Hacker News is an option, sure, but there's a limit to the amount of trust you can afford here, and a blog post isn't the most expedient way to explore complicated ideas.