create a video to promote your issue
Video can be a really powerful way to share your issue. All you need is a webcam or a device that can take video. Keep the video short if possible, and explain why the issue is so important. Try to express your passion for the issue in the video. If you are more experienced with video, you can include images that relate to your issue, or other clips of video. Make sure that you include a link to your petition in the video itself, as well as in the description of the video. YouTube.com and Vimeo.com are great sites for hosting your video.
reach out to bloggers who write about your topic
There's no better way to spread the word about your petition than to have a blogger or journalist write about it and share it with their readers. If you're not sure where to start, do a search for your issue in a search engine. You can also search for a broader topic. For example, if your petition is about puppy mills, do a search for "puppy mills" to find blogs, but also do a search for "animal welfare," "animal rights," and even "dogs." This will show you more results for blogs that might be interested in your issue.
Visit the blog, and read some of the posts. You should get a sense as to if your issue is appropriate for the readers of this blog. If your issue is NOT appropriate for the blog, move on to the next one. Don't contact bloggers who don't write about anything related to your issue. But if the blog is appropriate, go to the blog's contact page and send them a short email about your petition. You can even use the same or a similar email to the one you sent to your family and friends.
alert local media
Alerting the local media is a similar concept to alerting bloggers. Do a little research about which media outlets would be a good fit. If your issue is very local, any of the city or town media outlets would be a great fit. For the media, you can either send them a casual email like you did with your friends and family, or you can create a press release to send. Press releases are more formal documents that outline the issue and why reporters should write about it. For a basic how-to about press releases, visit this page. The best thing to remember is to always include the who, what, where, when and why in your first paragraph.
add your petition link to your email signature
In the settings of your email program, you can set an email signature that automatically gets added to every email you send. Make your signature as short as you can, and include a link to your petition.
send updates to your signers
You can send up to three critical updates to the signers of your petition, to encourage them to share it with their friends (a great way to get more signatures), update them on the status of the issue, or just to thank them again for their support. To do this, go to your petition's manage page and click on the "update" button.