[dagw]

The problem is that there is no such thing as a universally agreed upon concept of public domain. If you actually care about licensing and want your project to globally and legally be in something like the public domain, in the US sense, then you're going to have to use something like the creative commons CC0 license.

Of course if you don't really care all that much about the details of international copyright law and just think it's cool to swear on the internet then the WTFPL will be fine.