I'm not familiar with ifit, it sounds like it is an app that lets you virtually run in a location and displays the view from there.
So why did the Fitbit rep ask if I fit is a partner? Well because if they are then your Fitbit miles would move you up the road in ifit.
Currently no Fitbit does have, I hope I understand, this feature.
I use My Virtual Mission which does collect Fitbit data. I'm NVM you decide the path to walk, if you want to walk as a team, decide if each person has to walk these miles or if the individual miles add together.. It displays a map of your path and how far you have gone. With the paid version it will show a street view of your location.