MASHABLE - Feb 11 - A new report from Ghostery, which creates products to detect and block data trackers, reveals which dating sites are using ad trackers. A data tracker is a snippet of code that companies such as Facebook and Amazon can implement onto other sites. Ad trackers on dating sites, for example, retarget the user on other websites. If a user goes to Match.com, the next time they go on Facebook they may be served an ad for Match.