Amongst my friends and family (most of whom are well travelled and well educated), I can think of a number of committed "Yes" voters eg: my father, retired radiologist, (former South African who also lived 2 years in NZ before coming back to Scotland as he didn't agree with the politics there), 2 lawyers, one sales director with a major telco, 2 highly experienced business people working on an inward investment project, one retired corporate banker, one Risk Manager, one MD of a major landscaping company, one consultant oncology surgeon, 2 GPs and one director of a major educational organisation; amongst the "Don't Knows/Not Saying" there is a education officer at the council, a 17 year old school pupil and one former Project Manager currently "working" as a carer for her dh; and the "No" voters are a corporate banker, an officer in the TA (also working on the Inward Investment project), a catering manager, an admin officer in a primary school, a SAHM former nurse, a retired bigotted primary school headteacher (I can say that - she's my MIL and that is my dh's opinion of her
) and a member of the landed gentry.
I hadn't been sure of the 2 GPs (my neighbours), but the appearance of Yes stickers on their window and cars was a bit of a clue! 
Maybe I've just been lucky, but all the discussions I've seen on my fb timeline have all been well mannered and polite. There is one friend with whom, by mutual agreement, the topic is no longer raised (although I know which way she is voting and respect the reasons for it) as she gets uncomfortable with differing opinions and thinks that that means that people don't like her (which she freely acknowledges is a problem personal to her). I've seen more rudeness and nasty aspersions on MN than I have on fb 
Twitter is a whole different ballgame - it's like the Wild West in there ! 