The specific answer (about this post) is that moderators haven't touched it in any way. Twitter.com links have a mild downweight, along with many other domains that produce a lot of sensational/offtopic content (relative to HN). That includes nearly all major media, forums like reddit, etc. Other than that, all you're seeing is the regular HN algorithm at work. It's more complex than just points + time—we've tweaked it over the years to (try to) do a better job of selecting for intellectual curiosity, dampening flamewars, and so on.
The specific answer (about this post) is that moderators haven't touched it in any way. Twitter.com links have a mild downweight, along with many other domains that produce a lot of sensational/offtopic content (relative to HN). That includes nearly all major media, forums like reddit, etc. Other than that, all you're seeing is the regular HN algorithm at work. It's more complex than just points + time—we've tweaked it over the years to (try to) do a better job of selecting for intellectual curiosity, dampening flamewars, and so on.