Coming up with a satisfactory definition of who's a journalist is tricky. But as the New Yorker's George Packer notes, to devastating effect, identifying non-journalists is easier. And Sean Penn, who recently wrote some pro-Venezuela/pro-Cuba agitprop for the Nation, is a most definitely a non-journalist.
My suggestion: read Packer's post before you read Penn's "article"--which, among other things, is packed with fawning descriptions ("Also joining us for lunch was Antonio Castro Soto del Valle, a handsome
young man of humble character who is the 39-year-old son of Fidel
Castro") and blatant derelictions of journalistic duty ("I'm... infinitely aware that if I
were a Cuban citizen and were to write an article such as this about the
Cuban leadership, I could be jailed.... I
consider mentioning this, and perhaps should have, but I've got
something else on my mind"). Good stuff!