It seems to me that the survey was commissioned to state the bleeding obvious, so I was interested in other mum's responses. I am a first time mum (my dd is 12 weeks on Saturday) and the opening paragraph that states that new mothers only spend 90 minutes a day in the company of other adults apart from their partners made me laugh outright - I think in the last three months, I have only spent 90 minutes in total with other adults apart from dh. I guess it is the culture we live in, whereby people don't want to help out with the pressures of a newborn.
Only one other friend in my age group has a baby and survives through NCT groups, but like dizietsma and Heated, I can't do that - it seems to be a really intimidating environment. I don't think PND is even the issue - without PND, you can feel really isolated and with it, it just feels like there is no end. I know that as my friends start having babies, it may change, but then I'll feel sceptical about their motives - which makes me feel terrible!
But I knew, throughout my pregnancy, that it was going to change for good and that I would have to put my social life on hold, so I guess I shouldn't be surprised.