How to Track and Calculate Social Media KPIs

How do you track and calculate social media?

As the great Peter Drucker once said:
"You can't MANAGE, what you don't MEASURE".

So, how do you measure such a wobbly mass like Social Media?
Using Maths - fun right!

In these #nudenotes, I'm sharing some simple calculations that will enable you to wrangle that wobbly mass into something more tangible and measurable.
Shout out to @redwebsitedesign whose infographic inspired this spread of notes.

Which of these social media KPIs will you be measuring first?
Let me know in the comments.