my understanding is that English law doesn't require you to be aware of the injunction, it is made "against the world" which means it applies to all parties in England and Wales.
Maybe not. According to this week's Private Eye John Terry got one against "persons unknown" last year, but it was quashed by Justice Tugendhat because by not mentioning any specific targets, the lawyers were attempted to avoid a) having to tell anyone they were super-injuncted and b) having anyone argue against it.
There's also the case of Colin Montgomery, who had a super-injuction, but his identity was revealed by a newspaper which hadn't been told about the injunction.
"Everything should be made as simple as possible, but not simpler." -- Albert Einstein