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Not all fans are equal and, indeed, not all brands must turn to Facebook to drive their business. The short story is that there is no way to place a single value on a fan. The answer to the question: "What is the value of Facebook Fan?" is that “it depends.” Not only are some fans worth more than others, but the way you build up engagement on your page makes the value of a fan more or less potent.
The Art of a Facebook Post Crafting effective marketing messages on Facebook is both an art and science, this chart from pcgdigitalmarketing...