It's all about the numbers.

Our informational (we hope) and slightly irreverent (we think) take on all things analytics in the world of digital marketing and technology.
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But he went on to note that even active followers wouldn’t be the ideal metric to represent one’s distribution power on the social network. Instead, he suggested that tallying the number of times a tweet has been viewed and reweeted would be the ultimate measurement.
From Evan Williams, former Twitter CEO (Former Twitter CEO Says Network Needs a Better Metric Than Follower Count).  We keep saying engagement (just what he was describing) is much more critical than overall counts and we are happy to be vindicated by this statement.