Since there is question about zeitgeist being switched off, why not have a slider for "on" (tracking and recording of activity), "local only" (only zeitgeist and no info sent over the network) and "no recording" (all recording of activity switched off) (whatever the terminology will be in the end) and then a clickable link with something along the lines of "why is this important?" that takes you to the explanation in About Ubuntu.
Since there is question about zeitgeist being switched off, why not have a slider for "on" (tracking and recording of activity), "local only" (only zeitgeist and no info sent over the network) and "no recording" (all recording of activity switched off) (whatever the terminology will be in the end) and then a clickable link with something along the lines of "why is this important?" that takes you to the explanation in About Ubuntu.