ACFN, Inc. interview questions

I applied through a Craigslist post and received a call a few days later. I was invited to an interview and was told after the interview I would hear back by that Friday (two days after the interview). I never heard back on Friday and never got a response to my email I sent the following Tuesday. I have seen them post Craigslist ads identical to the one I applied for l, so it is safe to assume I was not selected for this opportunity.