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In order to use Social Media Influencers, you will need to connect with Twitter. This is a requirement from Twitter, and not a requirement from me. Rest assured that this is standard practice for all Twitter applications using the v1.1 API, and that there are no security risks associated with this. Click here to learn more about this application.
This application will allow you to search Twitter based on a keyword. It will then return the search results, ordered by popularity (with the most popular being on top). This is one way you can determine who the trendsetters are in social media. Learn more.