Where, if anywhere, can we see on each marketing activity who modified last, or the history of activity users on individual parts?
You want the Audit Trail under Admin >> Security.
As I am looking into some history of certain campaigns I am noticing that not everything is being tracked. For instance, I have a campaign that was deactivated and it is not showing up. Any ideas why that would not show up? The November 9th shows up, but not the October 22
Sorry, found the answer here: Change Details in Audit Trail - Marketo Docs - Product Documentation
It would be nice to see who disabled this Smart Campaign though b/c users were not getting content with this not enabled.