Number of hits from 1 July 2013 to 2 July 2014 for different queries as outlined in Table 1.

The relevant hits were counted after manual processing of the tweet content (where feasible). The signal-to-noise ratio (SNR) represents the ratio of the number of relevant tweets over the number of total hits for each query.针对推文内容，在可行范围内开展人工处理后，统计相关命中结果的数量。信噪比（signal-to-noise ratio, SNR）指每个查询对应的相关推文数量与总命中结果数量的比值。