Some of facebook page share video and request to type #ran or #ranran ! 有人说，它的工作，但它的 100% 假 . 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 !