It was used as part of a competition to win an iPhone.
NF stands for Now Following on Twitter.
PM stands for Personal Message. In Twitter this is a direct message.
Short Message Service
'F' could stand for any number of things on Twitter. The widely used 'FF' on Twitter stands for Follow Friday.
Slash Gash and Terror Crew.
OH stands for Overheard. As in "OH:What makes Twitter so popular?"
There isn't anything specific that this could stand for.
Around the internet it usually means, "No problem".
ÜT stands for the Über Twitter Client. The numbers after it stand for the person's GPS coordinates for their location (latitude and longitude).
I've heard it's "Don't Do That," but I can't confirm it. It seems logical.
k means thousand on instagram , twitter , and websites having to do with fallowers
I'm not sure... only think I can think of is "f*ck me running"