SueBaroo - you have raised a very good point, asking for definitions of socialisation and social skills.
For what it's worth, I often think that people get confused between socialisation and institutionalisation, both of which are necessary to get on in today's world, but are different skills.
To me, socialisation is about getting on in society at large with people of all sorts and working out how to behave with others on your and their own terms. Parents have a critical role to play in giving a good example (ie being polite, concerned, friendly when out and about in shops, at the doctor's, at the playground, with family and friends). But you largely make up the rules as you go along and adapt to the person in front of you.
Institutionalisation is about learning how to behave in an institutional setting with fixed rules and regulations that govern behaviour - like school, but also like church, the Brownies, a hospital, the workplace...
Obviously there is some overlap between the two, but I still find the distinction important as it makes you understand why it is important (a) to accompany your children in the outside world to teach them social skills (b) to send them to school (and other institutions) to learn to be accepting of a regulated environment.
And after all that, children need to be let loose to let off steam and use their own imaginations