Understanding YouTube Tracking
I want to track YouTube viewing in Marketo. I found @Sanford Whiteman's code via this post. My web designer added it to a test page and I was able to set up a basic smart campaign:

I have a couple of questions that I can't find answers to on here:
1. What is the "IM mark"? How do you decide that and set that up?
2. I want to track views of individual videos/LPs so that I can change status in the related program. How do I do that?
3. This article Track YouTube Videos in Marketo | Digital Pi from Jon Bourne outlines different query string parameters that can be used on the Digital Pi js. Can I use that on Sanford's?
Thanks in advance for your help.