Silicon Valley is still reeling from this week’s announcement that Yahoo CEO Terry Semel is being replaced internally by Jerry Yang. Yang co-founded the company in 1995, but some doubt he can lead Yahoo in 2007 – especially since it has already fallen so far behind Google. Speculators say making Yang CEO was a quick way to remove Semel, and the board will eventually replace him with an outsider. Considering the number of uncertainties that surround this story, it’s no surprise that Yahoo’s PR team isn’t talking. I asked a Yahoo representative today how the company plans to roll out Yang to a skeptical public. And since recent reports indicate that morale is pretty low at Yahoo, I asked how the company is communicating the move internally. The representative responded to both with no comment.