What kind of sites are not credible because anyone can change the information on them

Sites that allow anyone to change or add information without significant oversight or verification tend to be less credible. Some common types include:

1. **Wikis**: General wikis, like Wikipedia, can be edited by anyone, though they usually have guidelines and a team of editors to oversee changes. However, some smaller wikis may lack such oversight.

2. **Forums and Message Boards**: Platforms where users can post and respond to messages, like Reddit or various online forums, often contain unverified information and personal opinions that may not be reliable.

3. **Social Media**: Platforms like Twitter, Facebook, and Instagram allow users to share information freely, making it easy for misinformation to spread without verification.

4. **User-Generated Content Sites**: Websites that rely heavily on user submissions, such as blogs, personal websites, or platforms like Medium, may not have editorial oversight, leading to varying levels of accuracy.

5. **Crowdsourced Information**: Platforms that encourage users to contribute information collectively without expert verification can also be prone to inaccuracies.

6. **Review Sites**: While websites like Yelp or TripAdvisor provide user reviews, the subjective nature of personal experiences can lead to biased or misleading information.

While these sites can provide useful insights or starting points for research, it's essential to verify information from reliable, authoritative sources, especially for critical or factual matters.