Enemies tend to use almost anything they can find against you. The notion that one could sue Twitter is half witted nonsense. A 40 year old, land line telephone could also aid terrorists. Cell phones must be a dandy for terrorists and GPS obviously can aid bad people as well. Any drunk can use an automobile to commit a mass murder. The idea that the selling of a device or service that may, at times, be misused by bad people should not make a company liable. If my neighbor decides to commit suicide with a pistol should I be allowed to file a suit for proximity, traumatic stress syndrome, because i saw his brains on my lawn?