This is the story of three co-workers who met while working at the same agency.
I collected a month's worth of their data to see what I could learn about their friendship.
Location-wise, the coworker's friendship was centered around their workplace.
(The grey marker shows their workplace, each color represents a different person's geolocation trail.)
The more I looked at their data, the more I noticed how two of the co-workers seemed to spend more time with each other than with the third.
Look for the overlap between the two colors (each one represents a different person's location trail).
Months later, the coworkers whose data showed they spent the most time together moved in together.
When I suggested that the data had hinted at their closeness, they were dismissive.
(But you should look at the data yourself and decide.)
See the Map