Why do we care about Facebook? People you know and respect use it. That includes you. People you know and respect who scoff at it still know what Facebook is. Facebook, like Google, is popular enough to have become a verb as well as a noun. If the public ever got a crack at buying shares in it, lots of people would get rich.

That’s why mass clucking ensued among the technology press when the word came out Tuesday that Chief Financial Officer Gideon Yu is splitting. The Wall Street Journal, so far as we can tell, broke the news. It said: