After all, there is a fine line between a deftly-employed shout and a wall of all-caps text that looks like it belongs in an e-mail from your technologically-deficient grandma. “DON’T ...

The ALL CAPS tradition dates back to the 1850s, according to historians, when the teletype machines used by the military were made up of three rows of keys and none of them were lowercase.

In a blog post from 2012, Luis Villa, the senior director of community engagement at the Wikimedia Foundation, suggested that the all-caps convention began with typewriters, which didn’t offer a ...