I think a big part of it.... This has already been addressed with regard to email. Just for clarification, in terms of people who sign petitions and protecting their privacy, there is no way in which anyone would have any access whatsoever to an email address, whether you're the sponsor, the creator of the petition, the government of the day, or an MP who has agreed to be a sponsor. No one has access to that email address.
On May 26th, 2015. See this statement in context.