As much as any medium, social media plays "the numbers game" in an effort to bend perception. Let's not forget that the biggest fanboys and fangirls for social media are really marketing professionals and advertisers. They are the same people who learned to manipulate and exploit the tools before most average folks ever knew what a “Tweet” was. That being said, there is still skewed misunderstanding that numbers equal value or some type of discernible ROI.
If you thought Part One was a bit daunting, then you might as well delete any reference to this post. The following lists are what I refer to as "data points" that would be used from an analytical standpoint to break down each and every one of the categories on a per-social-channel basis.