Riverside2
Tweet to....? If I set up an anonymous Twitter account I won't get any followers
I appreciate your worries, but I don't think that's necessarily true. You don't have to use it like Facebook. Looking at Twitter, there are loads of pretty ambiguous accounts that say very little about the actual owner. Lots of people just automatically follow back people who follow/tweet them just to raise their numbers.
Just go on Twitter, get another email address, start an account that's not too Radical Feminist looking, (there's no point preaching to the converted), and follow/like/retweet loads of people as quickly as possible - writers, journalists (they tend to automatically follow back), newspapers, etc all mixed in with people posting pretty pictures, food blog (anything that's just normal interest).Then start dropping in links to the Petition, some of the appalling anti-women stuff form Lily etc.
Once again, you are not obliged to be "yourself" - create a persona that does the job.