Another "Facebook for Business" Offering

Cubetree launched a free collaboration suite designed to bring the capabilities of Facebook to the enterprise. But Cubetree's offering goes a bit further that social computing by integrating more traditional collaboraton capabilities such as file sharing, as well as Web 2.0 services such as blogs and wikis into a complete SaaS-based collaboration offering. There's a trend here, underscored by commercial products such as Telligent Community Server and IBM Lotus Connections to bring Facebook-like capabilities to the enterprise market, but where is Facebook itself in all of this?