SEO Tools: What are quantifiable metrics to measure social media's effects on search ranking?

Actually, this is something very hard to analyse for the time being, and based the following metric evaluation you can almost measure social media's effects on search ranking. 

Author centric Metrics

• Twitter metrics ie no of followers, Twitter list count, friend-to-follower ratio.
• Google+ metrics ie no of circles included in, circled to circling ratio.
• Influence metrics ie the Klout Score, Peer Index Score etc...

Content Engagement Metrics

• Twitter metrics ie the total no of tweets, no of tweets within the first hour/day/week, highest Klout score of a Twitter promoter, average Klout score of tweeters, total click-through from all Twitter-based short links.
• Google+ metrics ie no of shares, etc, highest Klout score of a Twitter promoter, average Klout score of tweeters, total click-through from all Twitter-based short links.
• PostRank score for content after hrs/1 week
• Facebook metrics ie no of likes, shares etc.

Hey! Thanks for the A2A. I think the response by Rameez is quite sufficient :) 

Traffic views engagement conversion .. etc.