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"F" is a term used by gamers and streamers as a sign of respect or mourning. It originates from a scene in the video game "Call of Duty: Advanced Warfare" where the player is prompted to press the "F" key to pay respects at a funeral.

K/D (Kill/Death Ratio) has been one of the biggest talking points in competitive Call of Duty for a long time.

MSN/Windows Live Messenger was discontinued by Microsoft in 2013 to be replaced by Skype as their instant message communication platform. Luckily, if you are still using the same hard drive, your old chat histories should be safe and sound, even if you upgraded to Skype.