If the number of fans on your Facebook fan page is your primary indicator of success, you’re really missing half the picture. You should also learn to gauge how much those fans are actually consuming, engaging with and sharing your content.

90% of Facebook users click that Like button and disappear. The remaining and vitally important 10% can be the lifeblood of a successful social media campaign if you know what to give them.

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How to Measure Your Facebook Engagement – SocialMedia Examiner