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by masklinn 4350 days ago
This is nothing more (or less) than manual emulation for footnotes, which long predate PG.
2 comments

You must concede that they are particularly prevalent in this community, and that PG's essays are notorious for their abundance of footnotes.

Oh, and they are used as a substitute for the lack of hyperlink markup in HN, which makes them a necessity when linking sources in comments.

> You must concede that they are particularly prevalent in this community

Not particularly so when compared with e.g. mailing lists (those I frequent anyway) and usenet.

It's also standard Markdown for [links][0][1], which is arguably the lingua franca for nerds on the internet.

    [0] http://daringfireball.net/projects/markdown/syntax#link
    [1] see what I did there