Netiquette of Capitalization: How Caps Became Code for Yelling
Typing in all caps is Internet code for shouting, and it is rude.
People have long used capital letters to set text apart and convey its importance, but upper case letters haven’t always signified loudness. The first bloggers may be responsible for that development: Linguist Ben Zimmer pointed me to old “Usenet newsgroups”—the precursors of the forums and Reddit threads that dominate the Internet today—where people hashed out what capital letters would mean online. In 1984, one user had to explain: “if it’s in caps i’m trying to YELL!”
Source: Netiquette of Capitalization: How Caps Became Code for Yelling | New Republic
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