Lifestreaming was originally conceptualized as the capturing of all digital "stuff" you create or interact with for your own purposes -- kind of like a very detailed diary. But like blogs, lifestreaming has been co-opted into the social networking impulse. Now, the idea of lifestreaming is to capture your blog and Twitter posts, YouTube uploads, records of what music you listen to, videos you watch, blogs you read and so on. The audience is now both you and your social group. The purpose is identical to the purpose of Twitter and Facebook -- human connection and personal memory.

A friend of mine named Steve Rubel is at the forefront of a widespread public exploration of the . He and others prefer Posterous. I have a , but use it only for posting iPhone pictures to Twitter. All I have to do is take a picture, then e-mail it to the address assigned to my account by Posterous. The service then posts a link to the picture on Twitter. You can post a wide range of media on Posterous, but so far I use it mainly for pictures.

I've been thinking about posting a lot more on Posterous. But I tend to forget. Lifestreaming only happens when you work at it. And that's where Lifelogging comes in.

The definition of lifelogging has evolved over the years. It started out as a science fiction-like lifestyle experiment to transmit live, first-person vantage point video all day, every day. Think The Truman Show, the story of a man who discovered his life was being broadcast around the world at every moment. But now it means all kind of things.

I'd like to propose a simplified definition: Lifelogging is automated lifestreaming. That means whatever experiences you'd like to share or record, you simply turn it on and the sharing or recording happens by itself.