It does exist on Facebook and Twitter.The Facebook page has links to many of the sponsors if you wish to contact them directly to let them know you intend to boycott them
There are 6 companies that are listed as FIFA partners and a further 8 that are listed as World Cup sponsors.there is plenty of options for you to withdraw your custom from many of them and let them know directly or via social media if you want to.
Absolutely and take a bit of time to contact the likes of coke,McDonald's etc.Let them know that until they stop sponsoring that corrupt organisation you will not be buying their products.Maybe if these companies bottom line is threatened they may hit FIFA where it hurts.