Diotima was a philosopher who Plato wrote about in Symposium. She was the one who apparently taught Socrates about love, and more or less gave him the concecpt of Platonic Love, and in fact her ideas on love give a basis for the Plato's concept of Forms in general. It should probably be called Diotimic Love really, but you know how it is, some man always gets the credit.
The biggest mistake the Bolsheviks made was sending Ayn Rand to University and letting her read Nietzsche.
Is philosophy useless? Well, it is now on account of the fact that I've solved it.
In the end the anarchists decided that any one overriding slogan was an unjustified hierarchical form of domination and it was up to each individual to freely pick their own slogan.