Facebook has announced that they are purchasing Microsoft’s Atlas Solutions division for a rumored price of less than $100mm. This brings to a close several months of speculation after details of purchase discussions leaked late last year. Facebook is demonstrating that they’re willing to spend the money and resources that are required to expand their ad stack. While they may never achieve their stated ambition of displacing Windows/iOS as the main method of interacting with a computer, there may come a time when Facebook is the primary interface for a brand to manage a digital advertising campaign.