Great Framework! With the exception of the first bubble objective (I think that should be a supporting strategy) I think this is a great way for you to think and lay out your Social Media Strategy.
Objectives > Goals > Strategies > Tactics
What are you trying to achieve it? > What is the measure of success? > What are the principles / methods / patterns that you intend to apply to achieve those? > What are the tools and how do you intend to use them?
Your tactics will change and adapt frequently; with new tools and new approaches to use current ones. Your Strategies, Goals and Objectives will change with less frequency.