Seeing lot of friends posting a videos and photos to prove that there are snakes crawling around their screens after commenting #ran on the comment section of the post. Wherein the #ran is FAKE.
This joke started when Facebook decided to give a tribute for the 20th anniversary of Harry Potter's first book. Magical animations pops out when you comment one of the five keywords on the comment section. But some people took this opportunity to make pranks on others by making a viral snake on the screen post.