Facebook ala manusia prasejarah ditemukan di Rusia dan Swedia.
|Communication: A digital visualisation of the Namforsen rock art in Sweden|
|Artwork: Animals, humans, boats and hunting parties are among the images painted on the rocks in Sweden|
|Ancient: Rock art in Zalavruga, Russia, that has been described as a prehistoric form of social networking|
|Mysterious: It is believed the Zalavruga rock art allowed prehistoric humans to communicate with one another|