Facebook or Twitter – Which is your preferred method for promoting business?

Before you say a business should have both, I am just wondering which platform you find your business gets more interaction from?
I have found Facebook to be a bit flat for a business/fan page, but Twitter (at the moment) seems to be great for interacting with potential customers.
Anyone else agree or are there still FB fans out there? (For business at least)

See original post by Brian123