While the campaign behind Proposition 22 already has a broad coalition of business, labor, environmental and taxpayer advocates, notably it has also surpassed the 5,000 fans mark on Facebook. You’ll recall that the initiative, known as the Local Taxpayer, Public Safety and Transportation Protection Act, will block the state from taking, borrowing or diverting local government revenues. As social networking increasingly becomes a major factor in campaign efforts, the “Yes on 22” camp has proven more active than other proposition campaigns in engaging voters and supporters through Facebook. And if you haven’t already, you can become a fan on Facebook here, as well as invite friends to join the coalition and become a fan. For more about the initiative, see here.