Rouhani doesn't write his own tweets; that's done by personnel in his office, an Iranian official told CNN.
The Iranian government, however, blocks Twitter and other social media in Iran, rendering the president's tweets as messages to the outside world only, though many Iranians circumvent the blockage.
Parsi couldn't recall an Iranian president ever writing for the Washington Post, largely because "there would be backlash at home," he said.
Abrams concurred about Rouhani's publicity blitz.
"There's a major charm offensive underway," he said. "The question is whether there is any substance to it."