Even common carriers do some censorship, for example they filter spam. So where is the line the drawn?
Discussion
I don't see how you can draw the line at anything other than "does not filter" vs "does filter" if you're trying to be consistent (which the law purportedly is)
Actually I am not sure if common carriers filter spam. Anyeays, social media or any other type of platform cannot possibly be called a common carrier, as there is a pretty clear distinction between displaying content versus providing the pipes over which content travels.