I can understand when I see the same ads across websites, and ads similar to my search history. Some tracking magic through cookies - fine.
But Skype has been showing me ads for exact terms I searched for in Google (Chrome), and nothing else. For example, after I searched for "Fossil messenger bag", all I saw in Skype was one Fossil ad for men's messenger bags. As far as I know, Skype does not snoop my system to read cookies/tracking info from Chrome.
Then I searched for "Infinity QX60" and now I see an ad for exactly that, with the name of a local dealer. When I click the little triangle, I'm taken to the http://dealer.com/opt-out/ - which is a different ad company than the Fossil one (http://info.criteo.com/).
The one and only thing that is the same in Skype and Google/Chrome is my (new, work) email address, which I use for both my Google account and Skype. So it seems to me that Google is actually giving away my personally identifiable information to Skype (or vice versa), i.e. my email address or at least unique hash of it (not much better, I think).
Is this even legal? I don't really care to be honest, just curious. The funny thing is the ads they're showing me are for one-time searches that have nothing to do with my overall browsing history and interests.
Extra Clarification: What I am asking is how the ads in Skype know who I am, i.e. what tracking info to use, since Skype does not use Chrome's cookies. If my email address is being exchanged between Google and Skype for the ads, then is that legal?