Starting a blog, or even just reading other people's blogs, makes you part of a club that gives you access to loads of other people, events, opportunities and secrets. The blogosphere is amazingly exclusive! Pass on the address of an unerground author and he might give you exclusive access to the beginning of his new book, for example.
Bloggers also forward the addresses of blogs containing funny or uncut videos that might be censored by the media. MySpace is epsecially well-known for sharing exclusive footage, as well as invitations to private concerts, shows or exclusive events.