Top 10 languages used in all verified Twitter tweets over the past 7 days. Language codes are shown.
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It's important to note that this is the detected language (by Twitter) and may not represent the actual language 100% of the time. However, it's accurate enough to make this type of comparison.
"und" means undefined and is usually for tweets that only contain pictures, etc.
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I don't think Twitter uses that setting to detect language in the tweets but I could be wrong. probably knows the answer to this.

