How do we validate the information from sources that have not been edited?

Technology opens up many more sources than might have been available in a library, bookstore, or newsstand. But much of this material has not been edited, nor does it have any accountable party committed to its reliability. How do we validate the information from these sources? How do we better separate fact from opinion? Also, do you find yourself checking google to verify something someone says right in front of people during a conversation? How would this behavior be received in a business setting or in a personal relationship?