Or just have an alternate login that you can use, with the real info in an encrypted backup. They're not, in general, going to look very hard.
The border agents ask a bunch of questions, most of which are completely content-irrelevant. Last time I came back into the US from Canada, the guy asked me where I lived and worked. C'mon, dude, I drove past something like ten cameras to get into this booth. If you don't have a Google Street View of my house (and, for that matter, my workplace - AFAICT I am the only person in the world with my full name, and one of two with the same first and last) in front of you on those monitors, then I want a tax refund. But that's not the point: he just wants me to answer questions to prove that I am, in fact, what I claim to be: an American citizen. Demonstrate proficiency with casual American English, have reasonable answers, have a plan that sounds reasonable (e.g., don't say that I plan to drive from the Quebec-NY border to Los Angeles in the next six hours).