it works. >> reporter: a secret sauce that's generated irish entrepreneurs like gaffney but has also pulled in internation companies like paypal who set up their european headquarters on emerald isle. pay pall has been here since 2005 but already back in the '80s you had tech giants like microsoft, dell, hp and intel investing in ireland and now you have this new wave of social media companies like facebook, linkedin and there's talk that twitter might set up its headquarters here. they're pretty much ireland's only lifeline for growth right now. one huge draw for foreign investors is the low corporate tax rate. barry o'leary heads it up to try