The accepted US-based campaign site Change.org is opening a UK division as ingredient of a wide-reaching squash. The opinion of the site's founder is that its success to date is based on letting petition organizers keep in touch with supporters after they have added person's name to a drive catalog.
Change.org is not the merely location annoying to authorize the community by means of online innovation. In the US it competes through Avaaz.org, Sumofus and Care2, and is probable to wrap topics already voted on by members of the UK-based campaign society 38 Degrees. The campaigns are marked as being sponsored and it's not spectacularly dissimilar than what you obtain if you look for Google for charities and see sponsored links.