Stephen Hood is co-founder of Blockboard (http://blockboard.org), a San Francisco-based startup that uses mobile technology to connect neighbors and neighborhoods. Prior to Blockboard he was head of product for del.icio.us, the pioneering social bookmarking service. Stephen has also worked at Yahoo and BEA Systems. Stephen's personal blog can be found at http://uniquehazards.com. He can be reached via email at firstname.lastname@example.org at on Twittter at @stlhood.