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Most of the time they are nothing more than an site:xyz.com equivalent that is just easier to access and you can group them to say something like !dev and searc
by YXNjaGVyZWdlbgo 5y ago
Most of the time they are nothing more than an site:xyz.com equivalent that is just easier to access and you can group them to say something like !dev and search hn, stackoverflow etc in one search without all the blog spam in between.