Social media is both mass media and personal media all in one. Social media product design improvements and reforms to Section 230 of the Communications Decency Act should be framed in the context of the reach of individual social media posts.
Conceptually, Section 230 continues to make sense for low-reach content. Facebook should not be held liable for every comment your uncle Bob makes. It’s when posts reach a vast number of people that Twitter and Facebook start to look more like The Wall Street Journal or The New York Times than an internet service provider. In these cases, it’s reasonable that they should be subject to similar legal liability as mass media outlets for broadly distributing damaging falsehoods.