If "Share with your Facebook App" doesn't appear when you click the button, refresh the page.
Spread the word about the petition using the Facebook or Twitter buttons.
Bookmark this page and whenever you have a spare moment, select a post and share. Repeat often!
People will not see every one of your posts, so for maximum effect you need to share something at least every week!
To get alerts when there is a new post for sharing, join the Messenger chat at