The points system is weighted to encourage users to answer questions and to limit spam questions. There are also levels (with point thresholds), which give more site access. Points and levels have no real world value, cannot be traded, and serve only to indicate how active a user has been on the site. A notable downside to the points/level system is that it encourages people to answer questions even when they do not have a suitable answer to give to gain points. Users also receive ten points for contributing the "Best Answer" which is selected by the question's asker. The voting function, which allowed users to vote for the answer they considered best, was discontinued in April 2014.