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Followerwonk - Followerwonk by Moz is a Twitter analytics tool to help companies better understand their Twitter followers.
burrrd. - A beautiful UI that provides you detailed twitter analytics.
Twitter Ads - Twitter offers targeted ad placement on their ad platform.
ilo - Premium Twitter analytics
Narrow.io - Build a Targeted Twitter Following
Narrow - Narrow helps you build a targeted audience and increase your influence on twitter.