daily knowledge: in the days when twitter was still young, twitter's official logo was a bubbly blue wordmark spelling out the name of the service. however, the image of a blue bird was adopted by the community as a way to represent the service prior to the company ever designing a bird logo officially. this idea was solidified by twitterrific, a 3rd party mobile client for twitter developed by the iconfactory. it came out early in the site's lifespan and quickly gained notoriety as being the defacto twitter client prior to twitter ever shipping one themselves. 
