Odd little post by a Michigan ABC affiliate:
…We understand that inappropriate advertisements are appearing on a small number of user computers on Web sites across the Internet, including abc12.com.
The source seems to be Spyware. Some web users may have inadvertently installed Spyware (commonly known as Zango or other third party Spyware) without knowing it by viewing a video from a disreputable Web site, playing a game or downloading an application such as icons, smiley faces or other software.
When users with infected computers search Web sites, inappropriate and unapproved ads may appear within normal advertising space without anyone's control and no revenue associated.
We want to reassure those who may have seen inappropriate ads on abc12.com that these ads are not coming from us.
Link here. [Update: They have now changed the text.]