Quora is a real-time question and answer service started by early employees at Facebook. Former Facebook CTO Adam D’Angelo was one of the founders of Quora. Before Quora launched, they raised $11 million dollars and was given an $86 million valuation. Facebook is developing a Q&A system themselves and may even have an intellectual property conflict with Quora according to Silicon Valley rumors. Quora had a loose invitation system before launching. If you have used the service, let us know what you think about it in the comments. [ReadWriteWeb]