In the US , the number one hit on my birthday was " With Or Without You " by U2 , which is rather cool because it 's quite possibly my favourite U2 song .
According to the above context, answer the following question.
What can be inferred about song rankings from the author 's specification of where the U2 song was the number one hit at the time ?


That the number one hit at any given time is most likely not the same in every part of the world .