Can I get an explanation of what "referrer domain" actually is? Im viewing my live VIsitor Stats on CPVLab for my Lead Impact campaign and I just dont understand what the Referrer-domain column represents. Anyone know? These are not the URLs of the sites the popup triggered, cuz Im assuming the "targets" column is showing this. Confused.
The referrer domain comes from the last domain that was redirected to before hitting your CPVLab domain.
Sometimes it can be the URL of the sites you advertise on, but that really depends on the advertising network.
The domain you're seeing as the referrer is probably a domain owned by Lead Impact.
The targets column should show you that information. Did you use the proper LI tokens in the CPVLab Link?
^^ Just to add that a referrer domain in LI is the last domain user visited before your ad popped up over the target domain you bid on. Most networks hide referrers but with LI you can often see real domains your visitors coming from and bid on them too 
You decide to bid or not to bid; very often these referrers are google, bing or youtube so proceed with caution 
Regarding the foreign visitors I'm sure these are spy tools and other affiliates "looking for ideas"...