social = connected with life in a society

• Crime and unemployment are the most serious social problems.
• Social customs/reforms/functions.
• Kuriachan leads an active social life despite his busy office responsibilities.
• People are encouraged to take part in social activities with a view to ensuring social strength and security.

sociable = fond of the company of others, friendly, showing friendliness

• Our new neighbours are not very sociable (social✗)
• They are sociable people who enjoy having parties.
• Ours is a very sociable little village where people enjoy social events and gatherings.