JAMES TARANTO: Mutually Assured Derision: The State Department makes a hash of diplomacy.

Wait, it gets worse. Some of Foggy Bottom’s tweeters are deadly earnest, making them totally defenseless against post-Soviet sarcasm. On March 26 Jen Psaki, State’s top spokesman, tweeted this: “To echo @BarackObama today-proud to stand #UnitedForUkraine World should stand together with one voice.” In an accompanying photo, a smiling Psaki gave a left-handed thumbs-up while holding up in her right hand a sign with the #UnitedForUkraine hashtag and her Twitter handle, @statedeptspox.

Yesterday, National Review Online’s Patrick Brennan reports, the Russian Foreign Ministry’s official Twitter account started including the hashtag in its tweets on the subject. Example: “[Foreign Minister Sergey] #Lavrov: Our US counterparts must compel the acting officials in Kiev to bear responsibility for the current situation #UnitedForUkraine.”

Barack Obama’s political operation frequently sees its Twitter hashtags “hijacked” by conservative antagonists. Remember #WHYouth? But in domestic politics, mutually assured derision is just good clean fun. Partisan politics thrives on antagonism. If the purpose of the domestic hashtags is to motivate Democratic base voters, conservative mockery is a help rather than a hindrance.

At Foggy Bottom, however, they seem utterly clueless as to what the Russians are up to.

And to think we were promised Smart DiplomacyTM back when Obama was new!