Once you have begun to understand the power of hashtags, you’ll want to study more of them.
To see how many people are using a hashtag or for tracking an online or offline Twitter event or chat that you want to start, Hashtracking is a great solution for getting powerful, free reports on any hashtag.
It shows how many Tweets were posted, how many people potentially saw a hashtag, and total retweets. Additionally you will get a display of the top 10 users from the hashtag, which is very helpful to identify key people for any topic, chat or event, as you did with WhoTweetedMe.
Cool Feature: Hashtracking makes it very easy to export all results to be used in a presentation, and will also soon include a geographic analysis option.