Jack Wang remembers an odd new rule written at the bottom of the his high school writing exam in China: no Internet words.
"It's just natural right when we use it," he said. "It's the youth way of expressing ourselves."
What may seem like the petty irritation of an old-fashioned teacher might actually be something bigger. More than 500 million people are online in China. They are microblogging, instant messaging and texting.
And the Chinese language is changing as a result, says David Moser, an American linguist who lives in Beijing.