We're started a Q&A around the new data store Digg, Twitter and Mahalo are all using. it's called Cassandra.
details here: http://www.cassandraanswers.com
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Cassandra Answers: http://www.cassandraanswers.com
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The personal blog of angel investor and entrepreneur Jason Calacanis.
So many new question and answer sites it makes me wonder, Is this a new strategy from mahalo answers that is simply in the testing phase? Obviously, all of these sites are based on the same technology. If you could then license off Q&A type sites with the MahaloQ&A branding, it could be a lucrative stream for Mahalo, or at the very least a way to get additional exposure.
Continuing to speak hypothetically, that would make sites such as stack-overflow and their system/model a competitor.
Just a few thoughts.