The user RiderOfGiraffes is claimed to have used the F word. Searching through their comments I can find no such usage, but the replies to their comments are consistent with the count given. I think the count is incorrectly including occurrences in replies by other people to comments.
Added in edit:
Following the suggestion from elsewhere I've tracked down the problem. It's counting the "Fuk" in Fukushima, the "funk" in "jazz funk", and the "Fack" in "Fack to Brunt".
So that's wrong, being mislead by the results from the search engine's false matches.