you are a teacher, producer of service, coach ... you have a large community (students, consumer of your service, consulting clients, fan, ...) you want to add a question & answer blog to motivate it. So you need this service. What is a Question and Answer site? A Q&A site helps your online community to share knowledge. People with questions get the answers they need. The community is enriched by commenting, voting, notifications, points, and rankings. Why offer Q&A on my site? Your members will enjoy the interaction that Q&A enables, and will visit your site more regularly. In addition, many web searches are questions, so Q&A content will attract search engine traffic. Fast and secure PHP/MySQL scalable to millions of users and posts. Safe from XSS, CSRF, and SQL injection attacks. Beat spam with captchas, moderation and/or flagging. Core Q&A features Fast integrated search engine. Categories and/or tagging. Voting, comments, follow-on and closed questions. RSS, email notifications and personal news feeds. Built-in user account management... User avatars and custom fields. Private messages and public wall posts. Log in via Facebook or others (using plugins).