Which scenario best represents the internet being used as a research tool by an investigator?

Posting a URL link to a survey on Facebook is an effective representation of using the internet as a research tool by an investigator. This action utilizes social media to reach a broader audience and gather data. By sharing a link to the survey, the researcher can efficiently collect responses from a diverse group of participants, allowing for increased sample size and potentially more robust data. This approach takes advantage of the internet's connectivity and accessibility, making it practical for research purposes.

While tweeting research findings or creating a podcast also involve the internet, they do not directly represent the act of gathering data for research. Conducting interviews over video chat is beneficial for data collection but is more aligned with qualitative research methods rather than a typical internet-based research tool scenario.