I have previously cited suggestions that internet folks are repeating very old trends in spelling and grammar. I would like to head a few decades before the Civil War citation to find an earlier root in a craze of the 1830s. People would intentionally misspell words, then turn phrases into acronyms and abbreviations based on those misspellings. The canonical example is “OK,” which stood for “all correct” (oll korrect). It was popularized when Martin Van Buren ran for president, because he had a nickname with the initials OK.
The roots of lolcattery lie in Martin Van Buren partisanship. Now you know.