[Fake identities for Jason Bourne were generated using this tool]
There are quite a few internet services require the user to have a U.S. address. PSN and Amazon app store are two examples that I use myself; by entering my real country I was blocked from accessing some U.S. only contents on PSN, and I also can't download the daily Free apps offered by Amazon app store for Android.
For those who are living outside of U.S., all you need to do to get full access (legally, since you're not doing anything bad) is to sign up using a U.S. address. However most systems will check your address validity so simply pressing random keys on your keyboard won't work.