Apparently these cookies don't get caught by anti-spyware programs because they're not spyware as such, but they do seem to be the source of tremendous popularity with the ladies.
Army of Brides in particular seems to plant a cookie that generates "letters from ladies" that are fake; if you read them they're nothing more than a "dear _____" with their profile text inserted. Completely computer generated. This seems to be a very good test for an agency's reputability - leave the cookies enabled for a few days then block them for a given site and see what happens to your traffic.
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