When I meet such people in meetups, all I hear is "I am the next Zuckerberg but I have no idea how things work. Where do I find someone to do the work for me?"
It's always strange to me (or sad, I guess) to me when people with ideas want to start businesses without being terrified by their own incompetence and ignorance. I think that's usually a sign that a person doesn't actually feel very strongly about the problem they're solving, and that's a red flag.
If you really, truly care about solving some problem, it should drive you crazy that there's something that you have no idea anything about. IMHO.
I so often have "I have this idea X, blah blah, what should I do?!?!"
And my response, every time is : "Stop talking about it and do it - or don't."
I mean, if you're not prepared to knuckle down and do the work yourself - do you actually believe in what you're doing?
These words were said to a very drunk me in a bar in London some 12 years ago, while I was fucking about with my first botched trainer-wheels startup (social networking for the elite - got serious traction, but we lost interest), and was garrulously asking some poor fucker what he thought I should do about idea X. That was his off-the-cuff response, but I've lived by it since.
More aggravating are the ones who think they're the next Steve Jobs and just need their Woz.