I would think that website traffic growth is the least important of these metrics, definitely not the one to lead the post...some of these are web services, others look like native apps...it's not an apples to apples metric at all.

Twitter/Facebook activity would be a more useful measure...not just followers, but how active the accounts are and how often they're handling customer inquiries. And yes, this can be gamed by buying followers...so what? Include the deltas and let readers decide the legitimacy of a gain of 50,000 twitter followers in a week for a no name startup