I think personalized media might bring information bubbles to a whole new level because recommendation systems are more efficient and achieving millions of YouTube views has arguably fewer intellectual hurdles than achieving similar reading rates via print or TV. The information passes though fewer filters (none), e.g. proof readers, team discussions. If that causes an increase of misinformation, then it is on Google to fix it, i.e. to reduce the amount of misinformation at least to pre-YouTube levels.