From the privacy statement
PetitionUSA collects aggregate information regarding what areas of our site users may access, as well as individual information volunteered by the user, such as contact and survey information and/or site registrations or petition signatures. Information collected is the property of the creator of the petition as well as PetitionUSA, (unless the petition creator has made use of PetitionUSA's arrangements for exclusivity). The information collected is used to improve the content of our site, to notify users about updates to our site, and may also be used by us or other reputable organizations to help contact consumers for marketing purposes.