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Announcing the Alpha release of KDE Linux
(pointieststick.com)
A community for everything relating to the GNU/Linux operating system (except the memes!)
Also, check out:
Original icon base courtesy of lewing@isc.tamu.edu and The GIMP
It's been standard since the early days of email and Usenet.
Not entirely sure what you're referring to, but if you mean that it's not only markdown, absolutely - what's immediately relevant here is that it is markdown we're using here, which can be used to look up formatting and is useful to know where else this syntax will work.
Just that that quoting convention has been used forever.