[jhull]

I wonder how this performs on short text posts like tweets. At my last gig where we did social media text analysis we used a few different packages (chromium, guess-language, and our own ngram classifier) and still had pretty low accuracy for tweets.

[AznHisoka]

Have you look at the metadata returned by a tweet? They also returned language, as well as location of the tweeter, which gives you some clues.