One of the greatest strengths of libraries is that the materials therein have a source, an author of the information. Even online databases such as ProQuest, Ebscohost, and others provide you the responsible party for the information.

True, the service provider cannot be sued -- they are just the pipe through with the material passes. The person who created the misinformation, on the other hand, should and must be held accountable. After all, one assumes that they are proud of their contribution and willing to stand by it.