Five questions Mark Zuckerberg should be asked by Congress

As embattled Facebook founder appears before Congress again, here is what should be put to him

• Five things we learned from Mark Zuckerberg's Facebook hearing

Zuckerberg made the rookie error of leaving out his notes, which an AP reporter promptly snapped. One section said: "Break up FB? US tech companies key asset for America; break up strengthens Chinese companies." Really? That's the best you've got? The senators need to drive this one home hard.