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YouTube places ads using matching technology.

Ad placement can be based on factors relating to the video, such as its subject category, or on interests and possible interests of the viewer, based on his/her viewing and browsing history.

Video creators can decide which videos they want to be so "monetized," but most opt for all their uploads to be matched with ads, says a YouTube spokesman.

Rex Heuermann, of Massapequa Park, has pleaded guilty to the murders of seven women whose bodies were found along Gilgo Beach and admitted to killing another. NewsdayTV has team coverage from key locations around Long Island.

NewsdayTV team coverage of Rex Heuermann guilty pleas in Gilgo Beach killings Rex Heuermann, of Massapequa Park, has pleaded guilty to the murders of seven women whose bodies were found along Gilgo Beach and admitted to killing another. NewsdayTV has team coverage from key locations around Long Island.

Rex Heuermann, of Massapequa Park, has pleaded guilty to the murders of seven women whose bodies were found along Gilgo Beach and admitted to killing another. NewsdayTV has team coverage from key locations around Long Island.

NewsdayTV team coverage of Rex Heuermann guilty pleas in Gilgo Beach killings Rex Heuermann, of Massapequa Park, has pleaded guilty to the murders of seven women whose bodies were found along Gilgo Beach and admitted to killing another. NewsdayTV has team coverage from key locations around Long Island.

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