Let me quote what voluntarily handing over personal information means at the university level:

"Obtaining written informed consent from a potential participant is more than just a signature on a form. The consent document is to be used as a guide for the verbal explanation of the study. The consent document should be the basis for a meaningful exchange between the researcher and the participant. The participant's signature provides documentation of agreement to participate in a study, but is only one part of the consent process. The consent document must not serve as a substitute for discussion."

http://humansubjects.stanford.edu/new/resources/consent/inde...

Seems phrased fairly differently from the typical "terms of use" document we get when signing up for an online service. So I ask. Should these be vastly different things?