Great question! It's generally considered best practice for agencies to have one Foursquare user account (profile) per brand/client that they are managing listings for. Since clients leave agencies all of the time, it is likely easiest to simply create a Foursquare user profile (using a new gmail, for example), then oAuth and claim the locations with it through the app. That way, if a client leaves, you can easily turn over the email account that is managing those listings to the brand. This avoids the hassle of having to go through the steps of reassigning and/or relinquishing management of those Foursquare listings.
