Retweet rank is a representative of the number of times a user have been retweeted by others recently.
twInfluence is a simple tool for measuring the combined influence of twitterers and their followers, with a few social network statistics
Twitority is an authority-based Twitter Search Engine, which serves as an alternative to Twitter's own search engine.
Measures your reach, ranking, engagement and displays it by location
What is Ad.ly?
Klout measures online influence, giving users a Klout score between 0 and 100.
LiveIntent brings social media to you. Suggested followers pay-per-follow advertising network.
TunkRank measures your influence by the amount of attention your followers actually give you.
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