Communications designer Sidney Blank got the idea for the site when his company moved into a new building in New York.
"Every building is set up with a twitter account so that others can tweet to it and follow the collective conversation. Once you have used STACKD for a while, the twitter feature becomes an important alert to information that is time-sensitive or changing. I could tweet that I have a chair to sell, or that I am looking for a tip on where to go for lunch. If we were to consider our building to be part of a network that can circumvent the borders of individual offices then I could also let other businesses know when our conference room is free or that we have a spare desk on Thursdays and Fridays."