"I said, we're a bunch of Irish guys here, would you like a drink? And he said 'sure' and he came and brought some of the Twitter guys with him. That's what works here."
Stone is now an investor in McCabe's startup, Intercom and sits on the company's advisory board. With offices in Silicon Valley and Dublin, Intercom makes software that helps businesses manage and track their relationships with customers. Set up last January, it raised €760,000 at the start of this year and will seek further funding in early 2013.
CEO McCabe founded Intercom along with Des Traynor, Ciaran Lee and David Barrett, having sold a previous tech company called Exceptional for a significant sum.
Intercom started with four employees and now employs 16. It will recruit engineers for its Dublin office in 2013.
McCabe says it is already close to being profitable. "We're only doing this to be a billion dollar company. We're really trying to make it very big."
He thinks any aspiring Irish tech startup needs to have a Silicon Valley presence. "Dublin, London, anywhere else cannot be Silicon Valley."