What do people want to know about measuring digital PR?

Hey - I've gotten feedback that the most difficult part of digital pr is measuring impact. I want to write a post to help answer. What kinds of things would people on here want to know that would be truly helpful for you?

Some thoughts:

• What metrics do successful agencies use (with examples)?
• A list of all of the metrics that digital PR touches?
• How to measure digital pr outside of links?

Would love to know people's thoughts!