Recently I saw a widget on the Stack Overflow website which says Stack Overflow now has its own currency called "unicoins". According to this widget, a user can earn reputation, customize Stack Overflow by changing its colors and the user can also remove the vote down button from their questions and answers by spending "unicoins".
This widget does not look real, because this is out of standard of the Stack Overflow website.
Also today is 1st April. Is Stack Overflow fooling us?