Come on guys!!! You IM'ers make your living figuring out new ways to game search engines, companies with billion dollar budgets, this is a donation driven browser extension.
It's been around for years and several sites (especially video streaming sites) already have things in place to detect it.
It shouldn't be too hard to implement something.
1 - get a few (2-3) links blacklisted by AdBlock. Linking to small transparent images or something.
2 - place the links on your page
3 - when someone accesses your page check if they load the links you had blacklisted. If only one link didn't load it could be problem with host, but if all of them failed you can be fairly sure they have some sort of blocking software running and you can proceed from there.
it's not rocket science
You could follow what Domo laid out or go with some of the pre-coded stuff you can find on google