A Facebook status update frequently seen when someone is extremely bored, and involves them replying to any likes on the post by typing a positive comment on that person's wall. It can become quite forced when the person who likes the post isn't well liked or well known by the poster of the status update. It also helps boost the ego of people who like the post as they are always complimented.
Alvin: Like for a like
Jason likes the post.
Alvin posts on Jason's wall: I've known you for ages and we've been on the same soccer team together.
"Like a Fox" is used after an action that one has just achieved as a discriptive phrase. When you have done something, adding "Like a Fox!" at the end will emphisize the slyness, talent or precision you or someone else has achieved something. "Like a Fox" can also be said; "Like Fox!". Like a Fox is traced back as far as an ancient phanton comic, where the Phantom states; "Crazy like a fox"
"I tricked you Like a Fox!"
"I am smart Likke Fox!"
"Stupid like a fox!" -Homer