According to John Metcalfe, "The Self-appointed Twitter Scolds", NYT 4/29/2010:
A small but vocal subculture has emerged on of grammar and taste vigilantes who spend their time policing other people’s tweets — celebrities and nobodies alike. These are people who build their own algorithms to sniff out Twitter messages that are distasteful to them — tweets with typos or flawed grammar, or written in ALLCAPS — and then send scolding notes to the offenders. They see themselves as the guardians of an emerging behavior code: Twetiquette.
What strikes me about this article is that complaints about spelling, grammar, and capitalization are merged — at least by Metcalfe and perhaps by the community of Twitter Scolds at large — with a wide range of other individual, cultural, and political criticisms:
Among the laughers and pointers is Jacob Morse, a 27-year-old user interface designer from Richardson, Tex. Last year, he and some friends started a Web site — Tweeting Too Hard — devoted to mocking self-important Twitter users. There, people can discuss fake-humble tweets like, “I gave my cleaning lady a raise today, even though she didn’t ask, as my own little contribution to fighting the recession.” Wrote one commenter: “Let’s hope she was grateful enough to overlook the bionic condescension.”
This is consistent with my general take on the social psychology of the new-media Gotcha Gang.
I haven't had the time or energy in this case to watch the watchmen, to see whether their judgments are as randomly flawed, from a merely factual point of view, as such interventions usually are. If you'd like to take up the task, some of the "twitter scolds" mentioned in the article are GrammarCop, Twenglish Police, Grammar Fail, Grammar Hero, Tweeting Too Hard, and Twitter Fail.
Apparently there are many others as well. Some enterprising scholar of Peevology could no doubt get a few research publications out of this phenomenon, thus raising the process another meta.
[By the way, current Google hit counts are
Note the forces of analogy (with etiquette) struggling against the general principles of English letter-to-sound correspondence..]