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See their site: http://www.relevantknowledge.com/about.aspx
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In order to participate in this research community, we ask that you install software on your computer. This software consists of research software, which tracks the community member’s Internet activity, allowing RelevantKnowledge to develop an understanding of how they and the members of their household use the Internet. In addition, RelevantKnowledge may occasionally invite its members to participate in online surveys that are designed to help companies understand members’ attitudes and interests on a wide variety of topics not necessarily related to their Internet activities. Participation in these surveys is optional.

We also ask that you authorize us to collect information about your TV viewing habits (including data such as the channels and programs you watch and record and the on-demand programming you order) directly from your TV service provider on your behalf. We will use this information, together with the other information we collect about our panelists to further enhance our understanding of how members use and interact with these services.
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