This blog post nails the major misconception about Facebook pages for brands and organizations:
Unless someone has actively interacted with your page, they won’t receive your updates. Many brands launch a Facebook contest to boost their fan count, assuming that their future updates are now reaching the thousands or millions of people who clicked “like”. But that’s not how Facebook works.
Unless a fan actively participates in a brand’s Facebook Page and their activity on the Page has been continuous, the brand’s status updates will cease appearing in the fan’s Facebook stream.