I tweet at least once a day and my goal is to have each of my tweets fall into one or more of these 4 categories (ICEE): Inspire, Connect, Entertain, or Educate — all of which I believe are somehow related to happiness. I get a lot of requests from people (including many Zappos employees) to send out a tweet promoting them or something they’re doing, which I generally turn down because it doesn’t fall into one of the ICEE categories.

Tony Hsieh, CEO of Zappos