This one came about because I was searching for a data set on horror films (don't ask) and ended up with one describing the links between philosophers.
To cut a long story very short I've extracted the information in the influenced by section for every philosopher on Wikipedia and used it to construct a network which I've then visualised using…
If you have a look at the third graph here labelled 'the continental tradition' you can see Foucault's 'sphere of influence' (at least according to the data entered here). As Simon Raper who put together this graph observes the data used is drawn from the 'influenced by' section on Wikipedia pages about philosophers and thus only delineates Foucault in relation to other figures designated as philosophers. Arguably Foucault's impact outside the narrow confines of the field of philosophy is far wider.
Very interesting. Thanks for finding it.