Whether Microsoft ponies up more cash for Yahoo, walks away or launches a proxy war it will be CEO Steve Ballmer's defining hour. Ballmer addressed his troops in a town hall broadcast Thursday (Techmeme) that was attended for a bit by Silicon Alley Insider's Henry Blodget. The bottom line: Microsoft has nothing to announce today regarding its bid for Yahoo, but will in "very short order." Ballmer's key quote via Blodget: We are absolutely 100% determined to build the most interesting position in the world in online advertising media and the kind of social connected social media experience. The future of the way people consume information is going to change in the next 10 years dramatically. We are absolutely committed... ...