Identify three disadvantages to internet-based research

What will be an ideal response?

a. without face-to-face interaction between participants and researchers, we don't know if the participant understands the directions and follows them
b. remote collection of data means that the researcher doesn't know about the quality of the data, that is, whether the participant took the process seriously
c. it isn't clear what population we can generalize our data to because we don't know the characteristics of the population from which participants come
d. the ethical guidelines associated with research may be harder to follow because participants may not understand the research (informed consent) or read about its purpose (debriefing); there is no opportunity for compensatory followup; participants who are not of legal age may participate