First startup: high-school classmates. Second startup: they were looking for a technical co-founder and talked to mutual friends of ours (who put us in touch)

First startup: high-school classmates. Second startup: they were looking for a technical co-founder and talked to mutual friends of ours (who put us in touch) Third and current startup: former engineering-school acquaintances, reconnected via LinkedIn when they started looking for a CTO.