On the internet that might be a website or it could be a post on social media. Typically, a post on Twitter, Instagram, Tik Tok, etc. should include a link or reference where the information is coming from or where their claims are coming from.
Much like the S.I.F.T tool, you want to take your time to learn about the source.

- Who runs the site?
- Who pays for it? (the url can provide a hint but is not all that determines it's value)
- What is the purpose of the site? Is it to educate and inform? Is it selling something? Can you find other sources to back it up?
- Is the original source of information clearly stated? The site might be using it's own research and documents or, often a site will pull information from other sources. Is that clearly identified?
- Are there links to to citations and data referenced.
- Are the site contributors and reviewers included, clearly showing their expertise?
- How current is the site's information? Does it include the date?
- Do they include policies about how content is selected?
MedlinePlus comes from the National Library of Medicine with the goal of providing vetted and reliable health information for the general public.