Jennifer Van Grove at Mashable’s business section touts Aardvark, Quora and LinkedIn in order to further brand affinity through their own online endeavors:
There’s a also a nice side effect of using these sites that extends beyond building up business acumen on the web. As a business owner, joining newer social sites will help to further introduce you to the influential inner circle of social media early adopters. Making digital connections with this crowd in the professional realm will have long-term business advantages.
Van Grove discusses each site in detail here.
Which networking and education sites do you recommend? Share your experience in the comments.