Which example best illustrates the use of the internet as a research tool?

The example that best illustrates the use of the internet as a research tool is the investigator using their Facebook wall to share a survey link. This approach demonstrates how the internet can facilitate the collection of data and feedback for research purposes. By sharing a survey link, the investigator is leveraging the platform's broad reach to attract participants, gather responses, and potentially engage a wider audience than would be possible through traditional offline methods.

Using social media in this way not only streamlines the recruitment process but also allows for real-time interaction and data collection, making it a powerful tool for researchers. It highlights how online platforms can enhance communication and engagement with participants, which is an essential aspect of conducting research in today's digital age. In contrast, other options focus more on communication or general interaction without the direct action of collecting data through a dedicated research tool like a survey.