Part of this seems founded on serving content based on what people do versus what they say. In the case of the video shown, they said they were interested in re

Part of this seems founded on serving content based on what people do versus what they say. In the case of the video shown, they said they were interested in recipes, yet didn't bother to pin anything for recipes. From the standpoint of the algorithm, they must not be very interested in recipes, no matter what they claim. Good or bad, this 'actions speak louder than words' approach isn't merely a social media thing. "Oh, the politician says they are for good thing, but they voted against the Bill for Good Thing." That is regardless of context, too. I don't know whether they have this feature, but it seems to me this could be mostly addressed with a 'Less of this' button. With a feedback mechanism, even if someone manages to inject an unrelated meme into a given demographic profile, those memes could be weeded out by a subset of those people who are just trying to keep their view the way they want it.