It's hard to find a business participating in social media that isn't doing something on Facebook. In fact, "I want a Facebook fan page," has replaced, "I want a company blog," as the single most heard request from clients in the social media world these days. With 350 million accounts and growing, it's no wonder.
Facebook is one of my favorite places to recommend for businesses for a lot of reasons. The primary one is that Facebook offers almost of all the various social media tools that companies can apply to their brand.