TwitterAudit: How many false followers do you have on Twitter? How many friends or public figures do you have?
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TwitterAudit (https://www.twitteraudit.com/) is an online tool that allows you in minutes to find out the quality of your audience on Twitter, as well as verify the quality of followers of any other account. The free version is quite functional and gives information about the percentages of inactive accounts or "zombies" that follow you, even without registering can be used to consult accounts of other people or institutions, useful thing to verify those who have bought followers to increase their numbers and seem more influential in the network than they actually have.
This not only serves for personal curiosity, the realization of campaigns needs to have an audit of this type for its better implementation and also in the case of public figures it is useful for the reliability and credibility, since if a high percentage of false accounts as followers of an account, you can suspect that user has bought followers to make an image and manipulate us.
There is a pretty good explanation (in Spanish) of this tool at http://www.christiandve.com/2015/06/twitteraudit-sabes-cuantos-seguidores-falsos-tienes-twitter-top-10-fake-espana/