Pop quiz: Which of these are commercials?
A video describing what McDonald’s Chicken McNuggets are made of.
A video showing LEGO toys being opened and assembled.
A video in which characters from the Disney movie “Frozen” drink Sprite.
All appear on YouTube Kids, a new free app — described as “kid-friendly content” for “curious little minds” — that mixes ad-like videos with traditional shows. On Monday, a Boston consumer group told federal regulators it’s hard to tell the ads from the programming, so YouTube Kids should be subject to federal rules on deceptive advertising.
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