Q: Where are Chechens from? A: Not the Czech Republic

(CNN) -- Memo to tweeters: Chechnya is not the Czech Republic. That's the message from the Czech ambassador to the United States. As it emerged Friday that the family of the two suspects, Tamerlan and Dzhokar Tsarnaev, is originally from Chechnya, those unfamiliar with the restive Russian republic rushed to brush up their knowledge of the region.