Behaviour of Multiple Tracking IDs / Visitor Association

[Dave-Silva]

Hi,

We have 2 websites on separate domains, that we want track with a single Marketo instance.

Site 1
Munchkin tracking code
Marketo forms

Site 2
Munchkin tracking code
Salesforce commerce forms

Our plan is to submit the munchkin tracking ID along with the Salesforce form, which will then be used in a Push Lead API call  to associate the visitor activity with the lead after it is synced to Marketo.

However, if a lead first fills out a standard Marketo form on Site 1, and then fills out the form on Site 2 (triggering the process above), what will happen? Will the lead become associated with the munchkin ID of Site 2 only, and Site 1 activity will no longer be tracked? Or does Marketo maintain the association of multiple tracking IDs?

Thanks,

[SanfordWhiteman · Accepted solution]

A record can have unlimited associated cookies. Wouldn't make sense otherwise: you couldn't even click a link on desktop and mobile!

[Dave-Silva]

That's what I figured/hoped. I just couldn't find any official documentation indicating that.

Perhaps someone from Adobe can provide a link to documentation that describes that behaviour?

[SanfordWhiteman]

Well, that’s the behavior of web analytics packages going back 30 years! So we wouldn’t expect to see it explicitly in the docs.

Every separate browser/browser profile/device has a unique tracking cookie, even for visits to the same domain. Once you have different private domain suffixes*, that’s even more guaranteed uniqueness because cookies can’t be read across domain suffixes. Invalidating data about Cookie A just because Cookie B is created is shooting yourself in the foot: if you’re lucky enough to get people to accept cookies, you preserve as much data as you can.

* private domain suffix is another way of saying registered domain. For example, a single cookie can be shared among subdomains  of example.com within the same browser profile. A cookie can’t be shared across example.com and example2.com, even in the same profile.