I personally would like a "real time" social utility (website/app whatever) that lets me directly interact with experts in particular areas including accountant

I personally would like a "real time" social utility (website/app whatever) that lets me directly interact with experts in particular areas including accountants, plumbers, mechanics and being able to get simple questions answered in real time. I know there are websites like ask.com etc. but not good enough for me. Once I have an answer or response, it could be viewable or sharable by others who are looking for similar stuff.