According to Eric Meyer anyway. The way he's putting it, blogs are the opposite of every other way of viewing information. Think about a film - you start in the past but work your way into the present. But on the front page of a blog, the first post represents the present and any further entries take you further into the past.
This could mean that posts you read are out of context, have no background - because that was established at some point in the past. Heeeeere's Eric.