When I meet folks I'd like to get in touch with professionally, I generally give them my e-mail address and try to connect on LinkedIn after reminding them who the hell I am. Facebook is right out - to me, it just doesn't send the right message. I haven't got anything incriminating or otherwise inappropriate, but "friend" doesn't seem like the right label to apply to a job recruiter in a city I'm planning on moving to, for example.

I have no intentions of ever using Twitter, and I am actively trying to reach a point where I can function in the modern world without a phone number.

I have never heard of bump.