Four billion!?

So, the games have opened.  I am all for having a global party, and for the Olympics to be seen a symbol of peace and shared humanity, &ct &ct…  But surely these media claims that four billion people watched the ceremony is stinking hyperbole.  That’s pretty much two in every three people.  What with it being a working day in many parts of the world, what with legions of other people being asleep,  and millions more without access to a TV, I don’t think it would be possible – even if every person in China was watching.