Asked standard and more difficult type questions. They do have quite a few "Aha gotcha! Questions as mentioned by others. Make sure you study the entire site including all the articles, blogs, etc. They will also ask the math question as mentioned below. Most questions were typical like where do you see yourself in 5 years, whats your worst flaws, etc etc. But there will be some about the company you will not know unless you do extensive research. The HR lady was perfectly nice. She keeps the interview very business sounding. No jokes, banter, etc. I feel that the questions are too difficult for the requirements they list out. The requirements sound pretty entry level, but it's obvious they are NOT looking for someone that is entry level. I think they need to be more clear about the level of experience they are looking for as this will save their time and interviewees' time. If you REALLY want to work here. Make sure you study the site back and forth. Also they will ask you for a salary requirement and she was VERY persistent about getting one. I feel the amount they want to pay is less than standard market rate because I listed something very reasonable for living in SF. Around 1/3 6 figures. Good luck!