In The Walking Dead Social Game on Facebook, walkers may be focused on eating you, but there are a number tactics you can use to survive. First, it's not necessary to kill all the walkers to complete a mission. Second, if you run far enough away from a walker, it will stop following you. Third, walkers can only be killed with a blow to the head. And four, if your movement cursor turns red, you'll need to be careful. This color change indicates that walkers will see you if you move to that spot. Once that walker catches sight of you, it will come after you every time you move.