Cassius, to my knowledge, the Nolan Chart, which either is the Political Compass, or resembles it greatly, was thought of by a founder of the Libertarian Party. Haven't checked Wikipedia in a while though.
Oh not the Nolan chart (which does, in my view, have a little value). It's the political compass test that I'm led to believe was invented by some lefties.
The Political Compass test was invented by some Labourites who wanted to criticize Tony Blair/New Labour from the left. That in itself doesn't make the test useless, but their refusal to release their answers for various politicans does.