Matt Winkelmeyer/Getty ImagesAdvertisers are souring on Snapchat, and Instagram looks poised to benefit in a big way. Financial services firm Cowen published on Friday its mid-year survey of ad buyers, and the results are likely to make uncomfortable reading for Snap Inc., with buyers saying they spent less money than expected on the teen-oriented app and that their clients vastly prefer Instagram. To read more about why ad buyers said they prefer Instagram, click here.See the rest of the story at Business InsiderNOW WATCH: What happens when you hold in your pee for too longSee Also:What you need to know in advertising todayWhat you need to know in advertising todayWhat you need to know in advertising today