After all of the discussion in recent years about Facebook's value as a company, it may seem hard to believe that 2013 is Facebook's first year on the Fortune 500 list. And as much as people like to criticize the company's ad strategy or privacy issues, there is no doubt that Facebook is the crown jewel of social media. The site announced in October that it had reached 1 billion active monthly users, and recent product announcements have spruced up the site's timeline and committed Facebook to a (much) stronger mobile presence with the unveiling of Facebook Home. The company makes this list not only because it provides the platform all others in this category are utilizing, but because Facebook also uses social media effectively to engage consumers. Of course, Facebook does have a Facebook page (with more than 90 million 'likes'). The corporate blog is easy to find—simply log into Facebook—and the company hasn't ignored other social media channels as a way to connect with potential users: Facebook has over 7 million followers on Twitter.
Wal-Mart retook the top spot, Berkshire Hathaway made the top five, and Apple grew enormously.