Twitter Influence Measurement

There are many ways and variables to measure influence and effectiveness on Twitter, but one thing is sure, the number of followers is not the only one. First of all followers can be bought, and many social media managers might be tempted to artificially boost their social credibility or to impress their bosses.
But are accounts with tens or hundreds of thousands of followers really influential? High profile accounts seem to attract an increasing number of fake Twitter bots seeking legitimacy.
A more telling measure of influence is the average number of retweets an account receives per tweet. Looking at the Top 10 most followed Twitter accounts we can see a large discrepancy between their actual effectiveness. Another sign of Twitter popularity is the number of times an account appears on a Twitter list.
Source: http://burson-marsteller.eu/2014/07/how-to-measure-influence-on-twitter/