The same thing happened to citizens band radio in the 1970s freely available and fun at first but impossible to use once the masses joined in.

FORBES: Digital Spin

Police in the area have mounted a major operation to track down the gunman, who is believed to have fled to a nearby gorge taking a citizens band radio with him.

BBC: Cape gunman kills seven

But with nativism on the march, it is also highly possible that Muslims will come to feel they have less in common with their fellow citizens than with their growing band of co-religionists elsewhere.

ECONOMIST: Islam and demography