From Gizmodo today: The First Radio Nerds Were A Bunch of Trolls
An editorial in the December 1915 issue of Electrical Experimenter magazine explained that around 1910, radio trolls were playing dangerous pranks by sending out things like bogus SOS signals. This, of course, was causing coastal radio operators who at first took the calls as genuine to more and more assume that they were getting trolled.
And 100 years later, trolling of a different sort still happens on a daily basis over at 14.313. Hehe.