Here’s an article with the answer. By way of background, WebVisible was formerly called SME Global. I did a biz dev deal with them way back in 2003! I think their model is to provide white-label PPC management solutions to IYPs and the like. So I imagine that the acquisition of Adapt is for the Adapt user interface and bid management technology.
Interestingly, WebVisible has raised a total of $17 million since inception, which makes me think that this acquisition was a mostly stock transaction, or a merger.