Can you please link your source to "stories made up by Estonian teenagers". I'm estonian and never heard of any teenagers making fake news.
This tiny little episode shows how easy it can be for wrong info to spread. I should have looked up the Buzzfeed story to confirm the country, but I winged it, and got it wrong.
So was my comment "fake news"? I don't think so, of course. I didn't set out to fool anybody, it was just a mistake. But it did push out a false fact to everyone who saw my comment.