The research source that needs to be carefully vetted to determine the writer's expertise is "online blogs."
This is because online blogs can be created and written by anybody.
Using the findings or posts from blogs as a research source can be detrimental because it might be written based on opinions or someone else that has no adequate knowledge of the subject matter.
Therefore, to confirm the reliability of the post or materials on blogs, one needs to vet the writer's expertise carefully to know if the writer has adequate knowledge or authority about the topic.
Hence, in this case, the correct answer is "online blogs."
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