That doesn't meen it is being accepted unquestionably by business though...or the media for that case. Stories about Facebook abuse abound, I even read a story of Facebook being in legal trouble today in a newspaper on the train.
But is Facebook the same as Enterprise 2.0? Not necessarily. Andrew defines Enterprise 2.0 this way:
Enterprise 2.0 is the use of emergent social software platforms (ESSPs) within companies, or between companies and their partners or customers.The emergent is the important part, and that is what many business people struggle with.
So in a post today he listed some of the questions that business people are asking about Enterprise 2.0 and the solutions it brings. Have a read and see if you have the same concerns. If you're a KM person have a think about how you would respond to these objections in a boardroom.