Creating a leaderboard based on 'following' list with a specific hashtag


I’d like to be able to create a webpage-based leaderboard to support a Twitter-based marketing campaign.
The leaderboard needs to track the number of accounts that a user follows which include a campaign-specific hashtag in their Twitter biographies, but I’ve not seen any examples of this ‘in the wild’ yet - is this type of functionality supported by the API?