The most effective search terms for finding an answer to the research question "Has the number of teenagers who experience cyberbullying increased?" would be:
- Cyberbullying
- Teenagers
- Increase
- Number of teenagers who experience cyberbullying
These search terms focus on the key elements of the research question, including the specific issue of cyberbullying among teenagers and the aspect of whether there has been an increase in the number of teenagers experiencing it. By using these terms, you can narrow down your search results to sources and studies that directly address the prevalence and trends of cyberbullying among teenagers over time.