"Journalism is the first draft of history," is attributed to Philip Graham, a former co-owner of The Washington Post. “If journalism is the first draft of history, live blogging is the first draft of journalism. It's not perfect, but it's deeply rewarding.” So wrote Andrew Sparrow in the Guardian.
Twitter and Facebook and all their variants are the first draft of biography.
They are also a preview for the people you haven’t met yet. How often do you hear “I Googled you.” And “I read your Facebook.” when you are introduced to someone?
Suddenly we all, potentially, have a public profile. A profile that needs to be managed.