The article already clearly distinguished the hosting function and the recommendation function. What makes those social media platforms common carrier is their

The article already clearly distinguished the hosting function and the recommendation function. What makes those social media platforms common carrier is their hosting function, you are taking about their recommendation function, which can be technically separated from the hosting function. For example, if they think Trump is bad, just hide him from everyone not following him. At the same time, still show his messages to everyone following him, for the hosting purpose.