As part of the second anniversary celebration for Overwatch, Blizzard has flipped the switch on a Double XP weekend. You can play half the Overwatch you normally do for the same amount of experience, the same amount of Overwatch for double the experience, or double the amount for a ton of experience.
DOUBLE XP starts now! ⬆️
This weekend Overwatch players on PC, PlayStation 4, and Xbox One will receive twice the experience points! pic.twitter.com/hxYPA0xRLQ
— Overwatch (@PlayOverwatch) June 8, 2018
You can get double XP on PlayStation 4, Xbox One, and PC.
Source: Game Informer Overwatch Double XP Weekend Begins Now