Facebook has launched their new Timeline feature to the world this week. Much attention has focused on the improved look and feel of the user interface, particularly the large cover photo that now dominates a Facebook profile.

But much less attention has been paid to the more interesting aspect of the Timeline – the ability to move back in time to any point and see what the user was doing at that time. In effect, Facebook has created an open diary because you can go back in time on your friend's profile to see what they were posting on the system last year – or even on a specific date.

This is an interesting development, not least for those interested in privacy. It used to be that you updated your Facebook and as the update dropped off the screen because new ones replaced it, that would then be lost forever. Now users can move back and forth in time examining every little post you made.

Many web watchers have already warned avid social networkers about the danger that they will arrive at a job interview only to find the interviewer has found some compromising photos online. But with the ability to move back and forth in time scanning the entire online history of a person, this danger just became a whole lot more real.

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