Don't waste your time with Facebook unless you're desperate. Like the other people mentioned here, there is something fishy going on with Facebook interviews. I really did well with the onsite interview and they told me that they passed on my application with no feedback after 2 weeks. I've gone through two phone interviews and then an onsite interview with 3 coding (ninja), 1 design (pirate) and 1 cultural/coding (jedi) interview. I have heard that they usually do only 2 ninja interviews, but I got 3 for some reason. The coding interviews are pretty standard. You either got it right or not. Explain everything clearly as you code it, because they may not understand your solution even if it's an optimal solution. Be prepared for follow up questions after that. Since I got the coding questions right, I got asked a second one each time. So on a successful interview be prepared to do 7 coding questions (again 5 in most cases).