1. A computer-implemented method for facilitating performance by task performers of tasks from task requesters, the method comprising: issuing qualifications to task performers to indicate abilities of the task performers to perform tasks; facilitating performance of tasks that each have one or more associated qualifications by task performers whose issued qualifications match the associated qualifications of the tasks; automatically tracking the qualifications that are associated with the tasks and the qualifications that are issued to the task performers who perform the tasks, the automatic tracking being performed by one or more programmed computing systems; for each of multiple qualifications, automatically assessing relevance of the qualification related to performing tasks based at least in part on the automatic tracking, the automatic assessing of the relevance of the qualification including measuring an aspect of the qualification with respect to each of one or more predetermined metrics and being performed by the one or more programmed computing systems; and providing information to one or more users regarding the automatically assessed relevance of each of one or more of the qualifications for use by the users related to performance of additional tasks.