There is not an authority like the Pope for Catholics.
But Sri Shankaracharyas based in five different places have a good command over a lot of Hindus. If you need more on Hindu culture, check the link.
There is no leader
You can become a world wide leader only if you are anointed by the Almighty God and he alone can bring it to past
Mother Teresa was known and respected world wide but was not a political leader.
Yes and it is now used world wide in the form of the Hindu-Arabic numeral system
Yes, the title "World Wide Web" should be capitalized. It refers to a specific network of information that is accessed using the internet.
World Wide Web
Approximately 13.76%.Worldwide Hinduism has more than billion followers. I would say around 20% of total population.
Yes, "World Wide Web" should be capitalized when used as a title because it is a proper noun referring to the specific decentralized system of information sharing on the internet created by Tim Berners-Lee.
It was the use of 0, particlarly as a place holder.
according to a survey of 2011 there are more than a billion hindus alone in India. And about more - million world wide. Not sure about 2015.
The United States took on a new position as a world wide leader
You can say World Wide Web faster than you can say WWW