Hashtools

"Hashtools - a suite of Twitter applications that aim to take hashtags further. The applications - #deals, #video, #question and #poll – use hashtags to aggregate tweets into different groups, making them more useful and easier to understand. Hashtags are used on Twitter to group and organise Tweets into different topics. Just add a # before a word in your tweet, and you create a hashtag that's used to categorise your tweet"