I agree that these are technical challenges, but they're not insurmountable. Any extension could itself track normal user behavior (e.g. mouse movement speed, s

I agree that these are technical challenges, but they're not insurmountable. Any extension could itself track normal user behavior (e.g. mouse movement speed, scrolling), and "learn" to mimic that. And as long as the "likes" are themselves quite randomized per extension, it's unlikely that the random likes will have much of an impact. It also seems not hard to filter out porn, politics and religion from the subjects being liked. I think the bigger risk is one or credibility - once the ad-revenue disruptor thing is in place, the creators might be tempted to sell their user data for a profit.