There is little evidence on social organization during the Mesolithic Period and whatever information we have has been deduced exclusively from archaeological finds. The people of the Mesolithic Period formed relationship bonds as their predecessors did during the Palaeolithic Period and lived in groups of 10 to 30. Living in a permanent location during the Mesolithic accentuated the feeling of cohabitation and cooperation.

The organization of voyages in the open sea to locate raw materials (obsidian, andesite) suitable for manufacturing stone tools and to catch large fish (Tuna) are some indications of cooperation and social integration in the Mesolithic society.

The numerous burials unearthed close to places of permanent settlement (Maroulas, Theopetra) are clues that show, in practise, a respect towards the dead and a belief in life after-death. However, during this period, based on the finds from Franchthi, differences in burial traditions compared to that of the Palaeolithic Period have been noted. Close to the entrance of the cave, 9500-9000 years BP, it appears that a permanent "cemetery" was set up where infants, children, adults, men and women were buried. Among the 12 or so persons found, evidence of cremation together with simple inhumations was observed for the first time. This differentiation in burial practices possibly reflects some social patterns. The increased number of jewellery items also suggests that personal beauty accessories were more widespread, and we can infer had become items of social symbolism.