Related Clues:
- They're on billboards
- Sitcom breaks
- Classified messages
- Computer screen pop-ups
- Some Internet pop-ups
- They might be classified
- Coupon bearers, often
- Campaign components
- Common revenue sources
- Channel-surfing catalysts
- Some feature jingles
- TV commercials, for example
- Commercials getting the axe, we hear
- One that cuts talking in commercials
- Advantages of publicity?