"Twahpic" shows what tweets on Twitter™ are about in terms of both topics (like sports, politics, Internet, etc) and axes of Substance, Social, Status, and Style. Twahpic uses Partially Labeled Latent Dirichlet Analysis (PLDA) to identify 200 topics used on Twitter. Try the demo and see what topics someone uses or what a hashtag is all about!

Try the demo: http://twahpic.cloudapp.net/