According to Venture Beat Dell has used Twitter posts (tweets) to ring up $1 million in sales over the past 18 months. "Dell (NASDAQ: DELL) says Twitter has produced $1 million in revenue over the past year and a half through sale alerts. People who sign up to follow Dell on Twitter receive messages when discounted products are available the company’s Home Outlet Store. They can click over to purchase the product or forward the information to others." Interestingly Twitter is under much scrutiny because the company has yet to reveal it's business model leaving many to wonder how the service will be monetized? Looks like Dell has been able to do something with the service that the service has yet to do, make sales. Regardless, Twitter is expected to announce it's plan for how to monetize the service in 2009.