[pzxc]

TFA stands for The Featured Article and always has, though I can understand your misapprehension because of RTFM which does use F as you suggest.

[jfoutz]

But remember to use fine if anybody important asks.

[gergoerdi]

The "F" in RTFM stands for "First": http://uncyclopedia.wikia.com/wiki/RTFM