Ford and BMW are fighting it out for high profile placements on Mashable and the site is just selling it out to both of them. Category exclusivity is a hard thing to figure out online, however I think this needs a solution. If I was either brand, I would refuse to pay for some of these impressions.
BMW ad drives to http://www.bmw-i-usa.com/en_us/
Ford drives to http://mashable.com/explore/