Note that this interactive Hashtag Scan is free and open to all, but to see the data beyond the "Summary" tab, and to save tagsets so they'll be at hand in Tweet Composer, just register or login (free). You can even create your own Scans in "Alerts" at the top - and set which ones to turn on/off - so they'll let you know when new hashtags are associated with your query. Remember: queries are topic words, hashtags, events, products, brands, schools, anything.