https://pinboard.in/u:marks/public/ recent bookmarks from marks 2010-05-22T12:56:55+00:00 http://www.lukew.com/ff/entry.asp?1102&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+FunctioningForm+(LukeW+Ideation+%2B+Design) markssocial media engagement community behavior motivation needs segment measurement identity reciprocity proof scarcity ties https://pinboard.in/u:marks/b:d05a13b96b76/