Ukrainian Instagram influencers are now warzone witnesses and urban warfare experts are tweeting tips to Ukrainian fighters, CNN’s chief media correspondent Brian Stelter said on “Reliable Sources” Sunday. But the onslaught of words and images is fueling a confusing media environment where disinformation is rampant.Ukrainian Instagram influencers are now warzone witnesses and urban warfare experts are tweeting tips to Ukrainian fighters, CNN’s chief media correspondent Brian Stelter said on “Reliable Sources” Sunday. But the onslaught of words and images is fueling a confusing media environment where disinformation is rampant.