Prioritizing items based on user activity includes determining a user interest based on a current user activity and prioritizing items in a list presented in a display based on the user interest. A method for prioritizing items based on user activity includes: determining a user interest based on a current user activity where said current user activity is an online collaboration activity with at least one collaborator and said user interest is based on group memberships shared with said at least one collaborator; and prioritizing items in a list presented in a display based on said user interest.