Since Facebook’s design team posted some before-and-after screenshots of today’s design tweaks, there has been some speculation about the existence of an “Outside World” News Feed filter that has a labs-style icon. Could Facebook be testing a FriendFeed-style feed aggregator so that users could consume any web content inside the Facebook stream?

Facebook says that is not the case.

“Outside World is a News Feed filter just for Facebook employees that shows only non-Facebook employees in your stream,” a Facebook spokesperson tells us.

Facebook has never made RSS reader-like functionality directly available inside Facebook, but when the company acquired FriendFeed a couple weeks ago, it was clear that the companies are thinking similarly about sharing. Today, users can only subscribe to other Facebook users and Pages – but we wouldn’t be surprised to see Facebook testing features like this in the months ahead.