No written policy on personal internet use?
Someone writing policy missed something. Personal use of company property is either conditionally granted or it's forbidden. There can even be tax ramifications when companies allow personal use of assets and that includes technology type devices, company issued cell phones, etc. Generally this is handled by adding some impugned value to your pay stub and you pay tax on that. I'd not want to say that lack of having a policy against something implies that it's perfectly OK.