Let's say your set up a raspberrypi at home (I assume you live in US), install apache, install wordpress, set up port forwarding and write a blog about making pickles. Then someone writes a comment under "How much dill?" and writes "I'm from Iran and I'm gay".

Are you really operating in iran? You don't have servers there, you don't have employees there, you're not a registered company there, what ties do you have with iran? Someone from iran "came to visit"? Sure, so do brits with amsterdam and legal weed.