Answer to "Why"

And whats more, Bill Gates himself helped me get an answer here.

Blogs had advantages over other, older ways of communicating such as e-mail and websites...
E-mail messages could be too imposing or miss out key people who should be included, said Mr Gates.
Websites were a problem too, he added, because they demand that people visit them regularly to find out if anything has changed and require regular updating to avoid going stale.
These problems could be solved, said Mr Gates, by using blogs and Real Simple Syndication (RSS), that lets people know when a favourite journal is updated. [BBC]