Your home router is no longer just a box that beams Netflix to your TV. In lab after lab, researchers have shown that the ...

"Netgear routers do not track any user web activity or browsing history except in cases where a user opts in to a service and only to provide information to the user," a Netgear spokesperson said, ...

Now the company that it was liberated from would need to be really anal to track the device to that level and probably haven't since they were left in a room that your friend has access to.