The power of the internet:
Via Language Log.
Folks at the Wisconsin Tourism Federation couldn't possibly have seen how the Internet would change the lingo when it was established in 1979.
But now that it's been pointed out, the lobbying coalition might want to rethink using an acronym in the logo. To anyone online, WTF has a different meaning these days. And it's not the kind of thing you want visitors thinking about when they think Wisconsin.