Is it possible that many of us might have this?
To be frank yes. There will be some members here who have undiagnosed ASD. But the majority won't.
There is another questionnaire (the AQ) here
developed by researchers in Cambridge.
Scoring at or above 26 means a person has a significant number of autistic traits. This isn't diagnostic but used to provide an indication as to whether a referral might be required. 80% of those diagnosed Asperger's/HFA scored 32 or above while only 2% of the control group did. People diagnosed with SAD or OCD scored higher than controls overall but lower than Asperger's/HFA overall.