With the recent official price drop of the Xbox 360 Elite and Pro models, Microsoft also hidden in the barrels of the press release regarding Twitter and Facebook. Apparently it seems that both applications will require a Gold Xbox Live Membership to run.

"Xbox LIVE Gold Membership will be required for Twitter and Facebook when they are available, and is required for Netflix. Games, media content and Netflix membership are sold separately; a hard drive is required for storage."

Although an update to that news post on Gamezine.co.uk has been updated to reflect that an MS spokeperson has confirmed that is not the case and the company is still forming their plans.

Source