Wow. Facebook can be a great source for free market research.
When I asked what was the one thing my entrepreneur friends wish someone had told them when they started out, I got SO much excellent response.
A few that seemed to really resonate:
"Think about health insurance."
"Don't sell your soul to the idea of being your own boss -- you gotta do it the RIGHT way!"
"Know your business technically. Know your business financially. Know your customers honestly."