Success on Facebook comes from a blend of sheer size of fan base, record of publishing useful content and the extent of consumer interaction that is offered.

We looked at eight major product categories to find the brands that gained the most traction on the site, comparing their Facebook pages to those of competitors to determine which were best and worst at taking full advantage of the platform.

Some big-name players -- Coca-Cola, Best Buy, Starbucks and Microsoft among them -- are performing especially well on the social-media site. Others, however, including Burger King, Walmart, Dell and Geico, might be missing some prime opportunities to interact with their current and potential customers.

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