Both stationary and mobile Facebook Messengers have received a slight lifting. The changes are subtle rather than revolutionary: stationary version has a slightly greater contrast between the white and blue elements and the minimalized chat window lies now slightly higher than it used to; in the meantime, the mobile Messenger now uses black and white colours and has also changed some of its icons. The changes have already been implemented, so you can go and check them ou yourselves. Messenger Lite will also receive them at some point in the near future.