The new SEN/D Code of Practice no longer specifies what documentation has to be used to record targets - each local authority up and down the country, and, in many cases, each individual school can choose what they call the document. So some may call it a personal plan, some may call it a support plan, some a personal support plan, some will continue with the terminology 'IEP'. that's why you might get contrasting things people tell you about if it is an IEP or not.
That's really just 'language' though.
The value of it should be, that everyone working with him, decided together what it is most important for him to work on, over the next 3 months. It is eminently sensible that these are targets to do with his social skills and relationships rather than literacy, although if everyone at the meeting doesn't come to an agreement, then it's perfectly possible to have a target (or 2) relating to different areas.
The targets should be really clear "Yes's DS to be able to...." and they should be written in a way that is measurable - so "improve" "develop" "work on" is not the sort of language that should be in there, it needs to be more specific, and detailed.
Next column (on an old IEP, which they may still use, or it might be set out differently depending on paperwork they are choosing to use now) states how they are going to get him to reach that target - so it might propose some social/relationship group work - maybe a lunchtime club or some support within the playground if that is where he struggles.
You then have a document in which people (usually the school, but not always exclusively) have recorded that they will do x, y, and z in order to try and help him reach those targets. You might agree to work on one of the targets too (or it might not be appropriate, depending on target).
Next term, you review it together, and everyone is expected to report on the progress made.
As a parent, it's good, as it means you have a written 'promise' that {insert target} will be worked towards.