Archaeologists announce the discovery of the oldest known #Twitter #hashtag, attributed to Neanderthals, in Gorham's Cave, Gibraltar. http://en.wikipedia.org/wiki/Gorham%27s_Cave#Neanderthal_engraving

Archaeologists announce the discovery of the oldest known #Twitter #hashtag, attributed to Neanderthals, in Gorham's Cave, Gibraltar.

http://en.wikipedia.org/wiki/Gorham%27s_Cave#Neanderthal_engraving