Swatting isn’t new; law enforcement encountered a ring of swatters in the mid-2000s. But the phenomenon is touching more and more lives in more serious ways. (The F.B.I. doesn’t keep statistics on swatting incidents; a bureau spokeswoman says it is still working out which part of the F.B.I. should handle swatting investigations, because the crime ‘‘crosses so many of our delineated thresholds for who handles what.’’) Activists and political operatives on the right and the left have been swatted. Reporters writing about computer security have been swatted. Celebrities have been swatted: Ashton Kutcher, Justin Timberlake, Rihanna. Politicians trying to pass anti-swatting bills, including a state senator in California and a state assemblyman in New Jersey, have been swatted at their homes. Video gamers, male and female, have been swatted. ... While a swatting hoax is often preceded by other kinds of Internet attacks (Twitter threats, the public posting of a home address or phone number), swatting is the most troubling manifestation of online harassment, because it’s not online at all — it’s actual weapons and confusion, showing up at your door. ... Swatting isn’t an easy crime to charge; law enforcement is still developing a language for it. Is it a type of fraud? Identity theft? Cyberterrorism? Is it a prank?