AOL said the appointment of Wunderloop would allow it to learn about visitor behaviour and offer its audience more focused content.
The appointment means that AOL uses three different behavioural targeting firms globally: Revenue Science, Tacoda and Wunderloop.
Wunderloop beat Revenue Science to land the AOL UK contract. Michael Steckler, the newly appointed managing director of AOL UK, said there was no conflict in working with the two firms.
"We see Tacoda as a very large ad network, which happens to have a behavioural targeting platform," he said. "We don't see a conflict in working with Tacoda and Wunderloop. We have a very valuable user base and need to take the business forward with ever more relevant ads and better segmentation to offer advertisers. AOL very much looks at tailoring things to local markets and we have an aggressive plan to roll this out to advertisers and agencies."
AOL bought Tacoda in July for an undisclosed sum. The purchase added a network of websites to AOL's portfolio and brought with it behavioural targeting technologies, allowing advertisers to better target consumers.
Wunderloop's UK managing director, Donald Hamilton, said that he hopes to secure more contracts throughout Europe, as AOL continues to roll out country-specific portals. He said Wunderloop offers consumers relevant editorial, as well as advertising.
AOL continued its drive into Europe last week with the launch of an Italian portal. The portal is driving its content business, following the sale of its UK ISP business to The Carphone Warehouse.