Anyone who looks at the Petition Site regularly will see examples of occasions when people have signed petitions in order to have the opportunity to make a comment saying that they disagree. If the petition is one that has attracted a lot of signatures, this makes it difficult to know how many of the signatories really do support the aims of the petition. Another campaigning agency, 38degrees, has a Disqus discussion page for petitions, enabling people to say what they think without signing the actual petition - if they can do it, why not Care2?