> Switching to English is way overblown a reaction. Two Hungarians chatting in English (unless there are non-Hungarian speakers involved) seems extremely weird to me. It may be partially that English is really foreign for us, while it's pretty close linguistically to Swedish, both being Germanic.

For what it's worth, I have a Swedish friend who almost always posts in English, even when he's talking to his family and other people he knows in real life. He'll switch to Swedish occasionally (and Facebook's autotranslation is very understandable), but 90% of the time he uses English.