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Your activity log goes all the way back to the day you started on Facebook. It is a private log of all the activity you have uploaded, contributed to and added to your profile. It is the be-all and end-all of everything that you have done on the social network.
This feature was briefly exposed last year in form of 'Memories', which leaked after someone hit the 'publish' button by mistake. Facebook pulled the social network offline for an hour afterwards to repair the damage.