The point of the study seems to be the importance of the pharmaceutical/medical industry's using the Internet to get their message across, because the more highly educated parents are no longer trusting their doctor for vaccine information.
"Overall, 249 respondents (19.9%) reported using the Internet as a source of vaccine information (hereafter referred to as “Internet users”; the remaining 1,004 respondents who reported not using the Internet as a source of vaccine information are hereafter referred to as “Non-Internet users”)...."
"Internet users were more likely to have at least a college degree..."
"An important finding in this analysis is that parents who use the Internet for vaccine information have lower perceptions of disease susceptibility. "
Translation: parents who trust their doctor as primary source of information on disease and vaccines are more frightened of diseases than the more highly-educated parents who do their own research on the Internet.
"The results of this analysis have implications for the role of the Internet in vaccine communication. Because Internet use and nonmedical exemptions are significantly related, it is necessary for the content of Internet-based vaccine information to best target the appropriate audiences..."
Translation: if more educated parents are going to decide that the Internet is a better source of vaccine information than their doctor, we need to put more effort into convincing them to get vaccines via Internet propaganda.