All browsers have to cache data in order to show you a webpage -- it's all deleted on close of Epic.
Yahoo's search only shows ads related to your location and search query, no personal targeting unless you're logged into a Yahoo service in which case their system may have some data stored about you.
Facebook ads are controlled by Facebook and are always targeted based on a profile of you -- we don't control them. To block ads, please install AdBlock via the Epic Extension store.
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