It's weird, the constantly evolving and widening definitions of "troll" in this day and age, as both a noun and a verb. I usually think of it as referring to a wide variety of online harassment, from deliberately rude contrariness on up to the edge of by-the-book stalking. But now, more and more, I see it used, as in this headline, in a positive light, meaning, I think, a kind of hip, winky, more than one off, mockery of someone else.