The only social network I can reliably guess that someone is on, regardless of job type, is, alas, LinkedIn.

My friend who is a biologist doesn't have a Twitter since nobody in her field uses it, but she has a LinkedIn.

My software developer friends have Twitter, so that's my go-to... but then it's a mishmash of business and personal. Or sometimes only personal, so it feels weird to talk business over it. So then... email, since soft devs - rightfully so - dislike LinkedIn.

I don't know the solution, but it's clear one should be built. Does LinkedIn have an easy "export my social graph" option to at least jump start w competitor?