Facebook has more than a million advertisers

"Over the past year I’ve had the privilege of meeting and learning from many amazing business owners who use Facebook. Some have just set up their Facebook Pages while others are experts who share their tips with others. I’ve learned from companies like Ministry of Retail in Singapore, Springwools in Ireland, and Scene75 Entertainment Center in Ohio…and many more around the world.
I know business owners like these invest their hard earned money and time into running their companies. So today, on behalf of everyone at Facebook, I want to say thank you to them and to the over one million businesses like them who are active advertisers. You have chosen Facebook as a partner to grow your business. We appreciate the chance to work with you, and we celebrate your success.
The more than one million active advertisers on Facebook are real people with stories that inspire us and each other. I’d love to hear your stories. And I know you like to learn from each other. I invite you to share your stories at facebook.com/business/success, so that you can inspire more entrepreneurs to turn their passions into reality. We all start small. And whether you’re reaching your first customer or your millionth, I’m thankful that we’re a part of your business."

Source:  Note from Facebook, 18th June 2013

Update - Screenwerk has more data:
"Here are some additional local/SMB stats revealed at the event:
There are more than two billion connections between local businesses and people
In an average week, there are over 645 million views of, and 13 million comments on, local business Facebook Pages
Approximately 70% of monthly active users in the U.S. and Canada are connected to a local business on Facebook"