Tomorrow (19 Feb) is NBA All-star game. Analyse tweets related to it and find: Most popular/unwelcome player in different countries, most popular team etc.
Use sentiment analyses to predict direction of stock movement. Eg. analyse tweets about AAPL for a period of time, including sentiment score, news volumn, new buzz (a change in news volumn), stock price. Build some simple model for price prediction.
Analyse songs/comments in 网易云 to build a recommendation system.
Analyse 微博 data to predict 贺岁档电影票房