One specific hypothesis was formulated a-priori: OXTR/rs224529 A-carriers and OXTR/rs53576 G-carriers Instagram users would show a differential number of posts and values of SDI in relation to the quality of relationship with the partner (a higher number of posts and values of SDI when low scores in anxiety and avoidance are reported; a lower number of posts and values of SDI when high scores in anxiety and avoidance are reported) compared to OXTR/rs53576 A/A homozygotes and OXTR/rs224529 G/G homozygotes users. Here, OXTR is linked to Anxiety.