Verizon DBIR challenge clue #2

This year's Verizon Data Breach Investigations Report (DBIR) challenge is well and truly underway. I see where the (public) contestants are stumped so, here's a clue to nudge them along.

This year's Verizon Data Breach Investigations Report (DBIR) challenge is well and truly underway.  I see where the (public) contestants are stumped so, here's a clue to nudge them along:

"The "F+" is one of those things that seem like something important at first but turns out to be nothing."

Keep hunting!

PS: Here's the first clue.