Now you can relive your childhood days through Facebook – the social networking site has been bitten by cartoon bug as millions of users are replacing their display pictures with their favourite animated character. Earlier this morning, “cartoons from the 90s,” “bobby’s world,” “1990 cartoons,”"muppet babies” and plenty of other cartoon-related phrases dominated Google’s list of hot searches.Images of the Flintstones, Thundercats, the Smurfs and other classic cartoon characters are taking over users’ news feeds on Facebook.According to the trend-tracking website Know Your Meme, the cartoon fad started with Facebook users in Greece and Cyprus in mid-November.The site said the original message was in Greek and translated to “From the 16th to the 20th of November, we shall change our profile pictures to our favourite cartoon characters. The purpose of this game is to remove all photos of human for a few days from Facebook,” reports ABC News.”NewGame: Change your profile picture to your favorite cartoon from when you were a kid. The goal of this game is not to see a human picture on Facebook, but an invasion of childhood memories until Monday. PLAY AND PASS ALONG!” said the message sweeping Facebook on November 19.Messages posted today include a cause in the call to action.”Change your facebook profile picture to a cartoon character from your childhood and invite your friends to do the same. Until Monday, Dec 6th of 2010, there should be no human faces on facebook, but an invasion of memories! This is for a campaign against violence on children.”A Facebook group page called “Change your profile picture to a cartoon character campaign” has been “liked” by more than 10,000 people.Another group called “Change your profile pic to a Cartoon or Comic book character” has been liked by more than 12,000 Facebook users.