Martin McDonald has written an interesting article about the metrics of social media for Forbes, located here: http://www.forbes.com/sites/martinma...eting-metrics/
Here's the most important paragraph:
What do you think? Do follower numbers really matter? If not, what are the social media metrics that really do matter?Let’s be perfectly clear, tracking social media based on likes, or follower numbers, is a pointless metric. For a start, both can be easily gamed, but increasingly platform are moving towards more sophisticated content targeting which for many companies means their chances of getting an ROI out of social media is significantly reduced.