We're not a financial blog, but it's worth noting that Yahoo has now fallen well below $10 per share, CNET News reports.

"The next critical milestone that investors need to be wary of is the $5 mark," the report said. "A number of institutional investors, such as pension funds, asset managers, and endowments, have policies that require them to discard stocks that fall below $5. As a result, a stock price's fall will greatly accelerate after that milestone is crossed."

All of this means that Yahoo still has no Plan C after the botched Microsoft acquisition and the rejected Google ad deal—which puts everything at risk, not just Yahoo's comprehensive mobile platform and service offerings.