Facebook has been running a series called "Building Social for Business". Past entries can be viewed here.
Today, Kevin Barenblat, CEO of Context Optional, will be at Facebook's headquarters at 3:30 Eastern (12:30 PT) to talk about how businesses can best use Facebook, and answer questions from the audience.
You can actually submit questions as well.
Context Optional is a social media marketing company (actually, they call themselves THE social media marketing company), which deals in social marketing strategy, creative design, application development, and community management for global brands and ad agencies. Its clients include Dell, Safeway, Chase, MTV, McDonald's, Red Lobster, Kohl's, Toyota, and Fandango.
I assume this guy knows what he's talking about if Facebook is having him speak at their base of operations.