My apologies, I just noticed a flood of these previously unrecognized domains which had a lot of "web chrome" around a central YouTube video. I shouldn't have included the language about flagging it, as that made my comment more negative than I intended it. I am slowly learning to pare down my HN comments to avoid that editorializing.
To determine whether something is really just "blog spam", I always look at whether the page adds anything that would be lost on YouTube. In this case there's the description, a link to slides, and information on the speaker. So this one gets a pass.
https://www.youtube.com/watch?v=LA-gNoxSLCE