... entities,events, opinions, etc., from a large volumeof tweets. Then, non-noisy tweets, together with the mined information, are indexed, ontop of which two brand new scenarios are en-abled, ... something/somebody. Next, tweets are clas-sified into predefined categories. Finally, non-noisytweets together with the mined information are in-dexed.On top of the index, QuickView enables two brandnew scenarios, ... frequent wordsthat most clearly express event occurrences are pre-sented; 4) users can search tweets with opinionsor events, e.g., search tweets containing any posi-tive/negative opinion about “Obama”...