apple.news/A3qmnx7qoMpeiwA7HWxTRMg Influencer marketing is at a turning point. In the days ahead of VidCon, marketing executives in Cannes, France, have been calling for more transparency from influencers and the platforms that promote them, such as Instagram. For example, Unilever CMO Keith Weed said his company will not work with influencers who buy followers. Meanwhile, in…