Alternate titles: Highscore.
Users want to know who are the very best performers in a category or overall
List a fixed number of competitors ranked by score from highest to lowest.
Allow ranked users in a highly competitive community to know who are the very best performers in a category or overall. Leaderboards can grow too stable and elite and thereby discourage rookie users from participating. Use with caution and only if the primary purpose of the community is competition, as introducing leaderboards can easily lead to gaming and non-constructive community behaviors.
Consider providing multiple views of a leaderboard across time (all-time, weekly, daily) and category (most points, most shares, etc.). All-time views are usually stable and sometimes (too) stagnant, why you should consider making the default view weekly or daily to showcase the “latest movers”1.