The curious fact is that a flint stone engraving recently found in the Aurignacian layers of Cantalouette II (Dordogne, SW France) bears a striking resemblance to the logo of the social network, what is quite funny at the very least.
Otherwise it is a very impressive early artistic expression of a rare type (avians are not common in Upper Paleolithic rock art). The Cantalouette II site was a flint stone quarry used by groups of the area and Arkeobasque (which is my source) speculates that it could be an expression of "art for the sake of art", an artist's caprice with no further meaning but excellent and very unusual technique, that was probably abandoned after its execution.