User blog comment:John Breasly/Request: Foreign languages in chat (this is different than the original request!!!!!) (Passed)/@comment-3416406-20120304191901/@comment-2040576-20120304192115

So long as both parties are okay with it. You can't start talking a language that someone doesn't understand in PM, people get quite insulted when they don't understand and it could often be insults.