Tool to find out how many people following trends on Twitter?

[FONT=&amp]I’ve just been asked this question by someone and thought I would ask here:

“Is there a tool that tells you how many people are following or searching certain trends on twitter such as #vouchers or competition, just like Google’s keywords tool tells you best keywords”.

Cheers
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Just Google this keyword “Twitter Trends” … you will get what you want. However, I would recommend you this website: tweetstats.com/trends