> wikipedia

Assume you don't read something that's been "vandalized" and embarrass yourself by sharing.

It might be going somewhat off topic, but don't repeat anything interesting you read in an email forward as truth. It's not.
Also, avoid sharing obscure facts if they seem counter-intuitive. Even if you're right, you can look like a fool trying to convince people.
Example: a Blue Jay's feathers are not blue
http://www.straightdope.com/columns/000728.html