adjective
1
BAD : The next election was won by the Social Party.
GOOD : The next election was won by the Socialist Party.
◆◆◆
social = connected with (life in a) society: 'Government attempts to tackle two of today's most serious social problems - crime and unemployment - have had no effect.'
socialist = connected with socialism (the political system that favours equality of opportunity and public as opposed to private ownership): 'Why is it that so many of these so-called socialists send their children to fee-paying schools?'
2
BAD : Our new neighbours are not very social.
GOOD : Our new neighbours are not very sociable.
◆◆◆
A person who enjoys meeting and being with other people is sociable : 'You'll like John - he's very sociable and easy to get on with.'