Calder v. Jones  465 U.S. 783 (1984) was similar to Keeton v. Hustler Magazine.  In this case, a Florida newspaper slandered a California resident.  In this case, the newspaper, The National Enquirer, did not contest jurisdiction (the newspaper is sold there).  The question was whether you could sue the publisher and editor of the magazine.

• The Supreme Court felt it was like sending a letter bomb, or firing a gun across State boundaries.  In either case, you are doing it with the specific intent to cause a crime in another State.  Therefore, you can be subject to personal jurisdiction.