Stop Unity from recording your activity in Ubuntu 13.04
Disable activity recording in Unity in Ubuntu 13.04
Here's how you can stop Unity from recording your activities in Ubuntu 13.04.
1. Go to Settings.
2. Go to Privacy.
3. Click on the Files tab.
4. You can choose to have the following activities not recorded by checking the checkboxes for each:
5. You can also toggle the Record Activity switch at the bottom right to the Off position.
For more, see the original article at the link below.