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1 definition by Mike in Virginia

 
1.
IFF
Inappropriate Facebook Friend- In which two people are Facebook friends with one another despite the fact that is completely inappropriate.
Often found in cases when adult males send friend requests to the high school or college aged children of their coworkers or friends.
Also common when someone is sexually attracted to but is unwilling or unable to pursue an actual relationship with a person; and thus substitutes Facebook friends status in order to be involved, even peripherally, with the person of interest.
When the inappropriate nature of the friend status is recognized by both people, IFF status enables them to view each others photos and send messages to one another without actually having to explain the contact to those who might disapprove of the interaction.
James has a niece attending college nearby, and she friended him on facebook. Since then, he has become IFF's with dozens of her female classmates. This enables him access to their photos, which he enjoys quite a bit.

Clarice and her son's lacrosse coach find each other incredibly attractive. They both look forward to every match when they can see each other. Since actual social interaction would be potentially damaging to both of them, they are content to be IFF's, occasionally sending innuendo-filled messages or swapping photos.
by Mike in Virginia June 23, 2011