Just 5 countries, the title and the map was promising more. On the method: what is the ratio of tweet that are unclassified? I do not believe your data to be a

Just 5 countries, the title and the map was promising more. On the method: what is the ratio of tweet that are unclassified? I do not believe your data to be accurate on the whole picture. For example, tweet on good restaurant is very frequents in Asia, but restaurant's names will hardly match some keyword.