NFF Denies Keshi's Resignation

The Nigerian Football Federation has denied reports Coach Stephen Keshi has resigned following their World Cup exit.

 Nigeria went out of the World Cup tournament in Brazil at the round of 16 stage after a 2-0 defeat to France, after which Keshi said: “It's time for me to go back to my family and face fresh challenges."
That was widely interpreted as a sign he had quit.
However, when contacted by Goal on Tuesday, a NFF spokesman said:

“Coach Keshi has not submitted an official resignation letter. He was not employed in the mixed zone [after the France game] or on Facebook.”

Also note that Stephen Keshi is not on Twitter, so the tweet from his alleged account isn't from him.