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I don't think it impacts loyalty as much as brand awareness that may help with acquisition. Loyalty in my mind comes after the brand introduction or "like".
Social: Expectations from Marketer post-Liking
Best "how to value a Facebook fan" graphic ever. #infographic
What #Facebook Users 'Like' and Why: Do Facebook Users Even Know What They Like? Facebook Brand Pages Lag Behind In ‘Likes’
Facebook Marketing Infographic, how to get more engagement
Does Your Facebook Page Need an Operation?
Yet another Facebook Timeline tutorial. Have you got it yet?
How To Get More Facebook Shares
How To Evaluate Your Facebook Page? #infographic
Facebook EdgeRank - What You Need to Know
5 Hidden Tricks on #Facebook