social annotations, user motivations, comparisons with other types of question answering services, and a range of other information-related behaviors. Research questions Some of the interesting and important research questions in this area include: What causes people to be involved in social Q&A? What is the motivation of people who participate in social Q&A? Why do questioners choose social Q&A as a source to find information? Why do they ask questions online to people whose background or expertise may be unverified? Why do they choose social Q&A over other sources to look for information? What do they expect from answers given by anonymous people on the Web? Why are the answerers willing to share information and knowledge with anonymous people, for free? Why do they spend time and effort to find information and help others online? Why are they willing to expose their personal stories to people and inform others with their experiences? Shah et al. provide a detailed research agenda for social Q&A. A new book by Shah presents a more recent and comprehensive information pertaining to social information seeking. Friendsourcing in social Q&A Friendsourcing is an important component of social question and answering, including how to route questions to friends or others who will most likely answer the question. The important questions include what people's behaviors are in social networks, especially what kinds of questions people ask from their social networks and how different question types affect the frequency, speed and quality of answers they receive. Morris et al. (2010) conducted a survey of question and answering within social networks with 624 people, and gathered detailed data about the behavior of Q&A, including frequency, types of questions and answers, and motivations. They found that half (50.6%) of respondents reported having used their status messages to ask a question, which indicated that Q&A on social networks is popular. Also, the types of questions people asked include recommendation, opinion, factual knowledge, rhetorical, etc. And motivations for asking include trust, asking subjective questions, etc. Their analysis also explored the relationships between answer speed and quality, questions’ property and participants’ property. Only a very small portion (6.5%) of the questions were answered, but the 89.3% of the respondents were satisfied with the response time they experienced even though there's a discrepancy between that and expectation. Also, the responses gathered via social networks appear to be very valuable. Their findings implied design for search