I've checked through the forum if this bug was already reported and didn't found any reference on that.
Russian Facebook names aren't displayed correctly in CivWorld. My facebook name is "Адам Кудонь", however it is displayed as "АдамÐ" in CivWorld. The correct naming convention should be "АдамК" instead. Moreover, "Ð" is not even a Cyrillic character so the display name function it's clearly broken in this case.