Hello. Thought it might be helpful to explain our stance on this one, just to make sure we don't get any crossed wires.
We do have a general policy of deleting threads that are specifically started to ask MNers to sign an epetition - once they are reported to us.
That's because we have lately seen a mahoosive rise in people joining MN purely to "spam" the boards with links to their epetition. Their interest, generally speaking, isn't really in joining in discussions but in promoting their epetition. This, quite understandably, annoys folks. So we do delete - and we clearly say we will in our Talk Guidelines.
However, we do recognise that many MN regulars may know about a campaign/issue that they'd like other MNers to know about, too.
We're fine with that, of course. But we do ask you, please, to frame your OP as a discussion of the issue, rather than a plain plea to sign an epetition - which, with the best will in the world, could well be seen by us and other MNers as a spammy epetition post.
So, an OP that said "Please sign this epetition to save endangered rabbits" would probably be deleted.
But one that said, "Anyone feel strongly about endangered rabbits? Did you know that rabbits are under threat from x and y?" - so clearly calling for a discussion, rather than just baldly promoting the epetition - would be fine. If you subsequently posted that there is a epetition about this, and included one quiet and tactful link, that would probably be fine, too.
We appreciate that it's a fine line - and that we may sometimes get it wrong - but our main concern is to prevent the boards being overrun by spammy links to frankly uninteresting or seriously annoying epetitions posted by people who have no other interest in being on Mumsnet.