3 datapoints used by UK business measure their social web ROI

Lessons in social web transformation : 3 ways to manage  social media better

For brands using multiple social networks, how do you calculate the ROI of each ? While  a few might differ on the metrics on which social network ROI is measured, By and large  these are  a few  benchmarks  on which the social media effectiveness is based 

1) time spent on the brand  page across social pages

2) referral traffic increase/ page views/ unique visitors

3)clickthroughs to visit the landing  page

4)Bounce rate ( users entering and existing from the same page)

5)increase in transactional depth ( likes, sharing or comment

6) Klout Score , which analyses  ranks and determines a  social media score which is given to each site and gives a ranking of the website's social friendliness.