Some of facebook page share video and request to type #ran or #ranran ! some people say its work but its 100% fake . You can appear snake on screen by installing android app .there are lots of android app to appear snake on your screen but among them . I suggest you 2 app .
2. snake prank
You got lot of app like this in play store ! install those app and you got some option to show snake on screen !
always stay with githacking !