Steps to measure Social Media ROI with Google Analystics

There are four steps to measure Social Media ROI with google analystics. Nowadays social media websites are very important one to globally.
Step 1: Implement Proper Social Media Tracking
Step 2: Track Social Media Last Click Transactions
Step 3: Track Social Media Assisted Transactions
Step 4: Track Off Site Social Media Influence on Transactions

 

you suggestion is very nice is general but why not be more specific for example how do you track Google +1 or say Facebook ROI?

Thanks

 

Sounds interesting and I would also like know some more detailed information.