I got 59 which is mild social phobia. Probably about right for nowadays, although I realised that my answers were frequently of two types - there were ones that had low levels of fear, but I almost always avoided them. These were generally social ones that were optional so I could avoid them (I sometimes wish I wanted to go to such things as I don't think the fear IS as bad now as it used to be, but it seems as though over the years the constant fear has actually made such things become unattractive and even boring and it is so much easier to stay at home and read a book). Then there are those that scare me a lot but I do them anyway because I have to (like making certain phone calls or talking to people in authority at work - formal oral presentations used to scare me [but these scare almost everyone to begin with] but years of practise at work means I can in certain instances almost enjoy them and just feel a bit nervous, not scared).
I am 34 now and have learnt a lot of ways to adapt to what was probably very severe social anxiety in my teens. However, I don't think the test is that well aimed at me and I'm not sure how well it would have picked things up even in my teens. For example, I always have more fear of looking people I KNOW in the eyes rather than people I don't know (same with other types of interactions too - I'm better with complete strangers than people I know - unless I know them very very well or they are considerably younger than me). Perhaps this is different from most people with social anxiety, I don't know.
However, there are other things that crippled me the most which aren't even mentioned. When I was in my teens I couldn't even speak to my parents properly I was so scared of disapproval/being laughed at - I imagine that most socially anxious people don't have a problem with their closest relatives unless they are in abusive relationships (which I wasn't), and certainly it wasn't mentioned. One particular problem I had was requesting things/help from people (including my parents) - it is still one of my major problems, but this was not mentioned on the test at all (apart from perhaps the talking to people in authority thing - however, I would have little problem talking to someone I don't know in authority e.g. a police officer, about something not too important, or requesting things from a professional, such as a ticket for the cinema or mortgage advice from a bank).
Answering the phone wasn't mentioned either (I get a surge of adrenaline even now when my mobile goes off, and people I know, know not to ring me). I am also still very uncomfortable with bumping into people I know, even if I know them well (if I see them first I will try to avoid catching their attention at all), having people I know see me at events e.g. cinema where I have gone alone (and want to be alone at), and one of my particular problems is greeting people - not complete strangers in a formal situation at all, but people who I know a small amount (perhaps I see them regularly on my way to work), I am scared they will want to stop and chat for longer and I will have nothing to say to them, so my chest fills with dread when I see them even though I know that it is nice that they are being friendly and they will be hurt if I do ignore them. On the other hand, I have no problem at all turning sales people down - I don't know them so I won't see them again, and actually find it quite hard to understand why other people can't just say no and walk away. Maybe this makes me appear rude, but my reasoning is that they are being rude for trying to force things on me.
Because some of the things that do still scare me are things that are fairly fundamental to social interactions and that most people do without thinking (and aren't even on the test at all) probably the score underestimates me. In fact I am finding it interesting that social anxiety seems to be scored mainly due to people's interactions with those they don't know well/at all and not those they know well (which after all are more important for most aspects of life). I would be interested to know whether people who are diagnosed with social anxiety (I never was) have problems (fear and inhibition) around people they know well (parents, close friends, colleagues) or whether it is mainly centered on strangers or people they only know slightly.