In most cases Answers don't get closed, so y australia business email lists ou can find questions asked more than 4 days ago and still contribute to the answer. LinkedIn Answers & Business.com Answers: These sites are great for more targeted communication, lead generation, and reputation building. Think of Yahoo! Answers and Answers.com as more B2C, and these sites as more B2B. This is Q&A in the context of advanced professional networking sites. Stack Overflow and its siblings: Stack Overflow is a great Q&A site for programmers.

If you're a software developer and you want to establish yourself as an expert and to network with your peers, this site's perfect. The same technology is now powering other niche sites, most notably serverfault.com (for system administrators) and Answers on Startups, which Rand Fishkin just named one of the 10 Sources I've Come to Love. Aardvark: Aardvark is more of a closed system where you ask questions to people in your network. This is great for well connected journalists and bloggers to get answers from their network, but may not be ideal for spreading your message beyond your social circle.