I've taken to sharing links and quick posts on my twitter account instead of here. Twitter is a real-time micro-blog network. It lets you write short posts and also watch a feed of messages from people you follow.
People can follow your posts without you following them back, making for an interesting usage slope: how much publishing vs reading. Wildly different uses result.
This blog remains the place for longer writing. A blog is a simple way of creating permanent public webpages. An important tool in the cyberage.
Why do I publish media online? To share information. To entertain. To advertise my business. To advertise causes I believe in. To write the history of my life. To help write the history of humanity.
What about Facebook? I am still a fan of Facebook. I find it useful for events, photos, and entertainment. Facebook remains a walled garden, so it doesn't compete with blogs or twitter for real web publishing. It excels as a more private communications infrastructure.
One of the speakers at Interesting Vancouver scoffed at Facebook as a community tool. Well, my pictures from the last Vancouver Zombie Flashmob were mostly collectively tagged when I added them to the event page on Facebook. That is community building.