Thank for the reports. Yes. We started that yesterday. Those types of ads are via google service called Adsense. You can identify those ads (from anyone) by the triangle in the top right of the ad.
Currently, you'd be a candidate for seeing one of you've visited our pgmusic.com site. If anyone here is an expert on Adsense and how it works, please chime in, as any tips are welcome!
I think PG is referring to AdWords more than AdSense.
Adwords puts your company ads out there on these sites.
AdSense distributes revenue to the sites that display the ads.
The tracking part is pretty simple; you visit the site and get a cookie that AdWords reads and then knows you showed interest in this site.
If you have that cookie, AdWords is more biased to occasionally show you an ad from this site; it is called remarketing, and for PG it should a be very cost effective and efficient tool.
In my eyes it's no big deal; I showed interest by visiting the site so it makes sense. No personal info is in the cookies. Some countries have laws that you must let the user know you are giving them a cookie that says they visited this site .. if you're that worried about it use Private Window or something so you don't store any cookies to begin with.
personal input:
To me, the key for remarketing is in how long you set the cookie for.
60 days is my personal 'base' bias, but some industries show longer/shorter is more efficient.
(no sense continuing to show my ad to 'User A' after 50 days since there is pretty much a 0% conversion chance at that point).
The other aspect of the cookie duration is that your remarketing list (people with an active cookie) must contain 'X' number of users or your ad priority drops fast because so few people are ever requesting it from the list. So you want a decent size list, but not to the point that it becomes inefficient and Google sees less users click the ad (the click-thru rate drops). When the click-thru drops your placement drops .. so it's all a balance and trade-off decision affecting cost.
Hopefully PG has a marketing team that is on top of this kind of stuff .. if not by all means give us a call! (or PM/email me)
Our marketing division is here -
http://www.rccwebmedia.com/ Google Partner for AdWords - https://www.google.com/partners/#a_profile;idtf=5755682898;qury=rcc%20web%20media
other company certifications (IT related) here
http://www.rccbusinessit.com/Partners.aspxYes, it's a shameless plug but also a perfect opportunity.
FWIW, I decided to check my PGMusic cookies and most looked fine to me, but this one stood out. Why would I need a cookie until mid-2019? The _ga implies it is Google related, FWIW.