Instagram's long-awaited algorithm has finally started rolling out, and food influencers and sites that built their brands on the Facebook-owned app are already feeling the squeeze and moving to Snapchat. Food photography—think pictures of perfectly-styled plates and overhead shots of meals—has long been one of the most popular categories on Instagram. Now that Instagram is stepping up its advertising and video efforts (the platform claims that it has more than 200,000 monthly advertisers) creators that have amassed large and active followers are having a tougher time standing out.