If author information isn't provided, be extra careful. Confirmation can be provided by other Web sites, your doctor or other medical professional, recognized medical journals, and other sources. However, keep in mind that just because you find the same information in two places doesn't prove it's true. Sources that only provide a partial picture are especially dangerous when dealing with health information. If the last update occurred months or even years ago, be careful.
Special care is required when using Internet mailing lists, newsgroups, and chat rooms.
All of them can be wonderful sources for support and information, but they're also very popular with hucksters and con artists. Newsgroups and chat rooms are especially popular targets, since they're usually not moderated. In other words, take anything you read with a big grain of salt. You can't be too careful. Internet information isn't inherently more or less reliable than information from other sources.