" If Twitter didn't exist, likely something else would have caused this woman to have this delusion."
And that is why this report started with the line "Twitter can trigger psychosis in predisposed users". "Predisposed" means that other things may also trigger it. The point of the report is that Twitter is one risk factor that should be considered, and the report provided evidence and explanation of why Twitter may more likely to do so than other activities (such as reading El Reg comments for instance).
Biting the hand that feeds IT
