Many businesses originally joined Facebook by creating a personal page and just limiting it to business content. However, a Facebook personal page (with "Employers" and "Friends") is not the same as a business page (with people who "Like" your page).
Facebook wants small businesses to convert these pages and has posted extensive documentation about how to do so. To learn more about the conversion, visit their mini-site at: https://www.facebook.com/help?page=213602951994043
Facebook believes that personal pages "aren't suited to meet your business needs" as business pages offer a much richer set of features.
To begin the migration, please go to: https://www.facebook.com/pages/create.php?migrate