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Looks like he's into Urban Kiz (I suspect a kind of Kizomba, which is quite popular in Europe).

Note: the author is also on HN. He made this:

I did not expect my weekend and week to be spent on the first page of HN, let me tell you.

Several, but as the other comment pointed out, Urban Kiz is my main focus, as well as Tarraxo and Zouk.

"Dance clip" seems to do exactly 0 things I can't already do with the video editor/folder system on my phone.

And dropbox is merely SCP/FTP, yet there they stand.