I have a question and am hoping someone in the group has an answer . If a person on your lead/ target list forwarded a piece of content to a colleague, who was not on your list, and that piece of content did not have a form fill would the campaign be able to capture who they are? Additionally, what if that piece of content was the 3rd piece in a particular stream. Would the campaign pick up that the colleague had not received the first or second piece of content and place them at the top of the stream?
I do not believe that Marketo tracks forwarded emails. In regards to the content: without a form, there would be no way to gather information about the colleague that it was forwarded to.
What was type of content are you trying to track? (example: landing page, pdf, etc...)