Source: FactoryCity » Groups for Twitter; or A Proposal for Twitter Tag Channels
Stashed in: Twitter!, History of Tech!
If I recall correctly, Twitter hashtags were in fact invented by him.
Why is @brainpicker so into the color yellow?
Pinterest, Google+, and Instagram all grew a lot in the last year.
Twitter's Marketing Problem
#MyDepressionLooksLike: Twitter Users Share Their Emotional Stories With Hashtagz