> Fortunately your opinion doesn’t trump the Constitution or settled law.

Neither does yours? This is a nonsense claim.

> Anonymous (or at least pseudonymous) speech has been a feature of American discourse since before the Revolution.

You're just cherry-picking which ideas you like from the founders or early America. Slavery was also a feature of the United States. Whether we had something in the past or not isn't necessarily a good enough argument to keep doing it.

> Without anonymity, you lose whistleblowers,

We can figure out other ways to have whistleblowers without social media.

> effective criticism of the powerful from the weak, and “public interest” leaks like the Snowden revelations.

Snowden, who is living in Russia.

> You lose outlets where the abused can ask for help and advice in escaping bad situations.

The only way to do this is on social media, anonymously? If so, we have a much bigger problem. An emergency, even.

> You lose any/all criticism of employers current and past; who wants to hire a complainer?

I complain about past employers all the time. I don't think you lose this.

> You silence people who are afraid to give their opinion because of their employer or parent.

I don't think so. And both left and right political blocks have gotten plenty of people fired, even those who post anonymously.