It may be possible to add informative links to each ePetition. Perhaps anyone could add a link to relevant information, with a brief summary of what it's about? However, this presents problems of information overload because there is no mechanism for filtering the good from the bad.
Search engines have developed into powerful tools for filtering information because they automatically look at how many referrals a site may have, and the "credibility" of each of those referrals. The result is that the most relevant information is presented quickly. Using conventional search engines (and there's a number to choose from) arguably provides a better information system than allowing voters to add links to an ePetition system.