humans are said to be 'social animals' we live in society; so most persons are social persons, Some avoid society and we might say they are anti-social. However I think we often tend to use social and sociable interchangeably, but they really are not the same. A sociable person likes company, seeks conversation, likes society, seems friendly and is not stiff or formal..

social Of or relating to society or its organization: "alcoholism is a major social problem". sociable Willing to talk and engage in activities with other people; friendly.