Are print shops responsible for the leaflets printed in them? Are phone companies responsible for the content of the conversations that take place over their lines?
> Are print shops responsible for the leaflets printed in them?
A case could be made that, yes, they are if the leaflets are obviously threatening.
> Are phone companies responsible for the content of the conversations that take place over their lines?
No, but they are responsible for a) not self-editorialising them (which Twitter, Facebook, etc are) and b) are responsible for assisting investigations where such crimes take place. Facebook cannot even tell who is paying for their advertisements. This wouldn't fly for a telecoms company.
