People will always optimise their behaviour to maximise their benefit, this is the biggest problem with most services that seek to measure influence in social media. Inevitably they won’t. Instead what you get is a measure of who manages to work out how the score is calculated through luck or design, and then game it. At scale.
So instead what you have is a way to measure who is the best at playing the social metric game, which may or may not be the same thing you set out to measure in the first place.