1. Will the websites that are blocked by a result of SOPA only affect US citizens? 2. Can a foreign TLD such as .dk, .se etc. get blocked? 3. What happens if you use the IP-adress to ThePirateBay instead of the domain name?
2. Yes, blocking access to foreign websites is the whole point of the legislation. Note that this would only mean that US-based users wouldn't be able to resolve your .dk, but everybody else (i.e. in Europe or Asia etc) would still be able to do it.
3. Good question. Again, this will depend on the technical implementation; I believe at the moment they're only talking about blocking DNS resolution. The minute they block IP-based connections, you basically have the Great Firewall of America in place.
2. Are you talking about the entire TLD? Then, no. If you are talking individual domains, then, yes, those are the targets of this bill.
3. ThePirateBay is exempt from SOPA DNS-blocking since it is a dot-org. IP-addresses are exempt of course from DNS-blocking. Plus, it looks like DNS-blocking has been pulled entirely from SOPA (but let's watch that play out). AFAIK no one is exempt from interfering with payments from advertising and payment processing companies.