Abstract: A collaboration system automatically detects an achievement, milestone, state change, and/or other triggering event associated with a particular recipient, solicits contributions to recognize or celebrate the triggering event from a select set of individuals that have established relevant relationships with the particular recipient, and generates a collaboration board by arranging the contributions based on the relationships and the sentiment expressed in the contributions. The resulting collaboration board presents the contributions in a single view, at the same time, and in an arrangement that elicits the strongest emotional response from the particular recipient based on expressive contributions from contributors having the most important relationships with the particular recipient being topmost and frontmost in the collaboration board.