For some time now, ISPs in Vietnam have been blocking a small number of websites, particularly Facebook. Fortunately, the number of blocked sites was really small (in China hundreds of sites are blocked) and the method of blocking traffic to Facebook was very weak. The Vietnamese ISPs simply stopped returning DNS queries for the Facebook domain. So everyone soon figured out they could simply change their computer's DNS settings to use a non-blocking DNS server, such as Google's (8.8.8.8).

I'm hearing rumors now, while I'm traveling in Europe, that Vietnamese ISPs have really cracked down on access to Facebook and that the DNS trick no longer works.

So here are some more foolproof ways to get around the Facebook block in Vietnam which will also work for any website that is blocked in any country. For example, the Great Firewall of China blocks access to an ever-changing list of sites by more than just DNS. But these methods should work there too.

An added advantage is that you may also be able to access US sites that block all non-US computers like Hulu and certain YouTube videos.

1. Pay for VPN access outside of Vietnam. This is essentially what I do by renting a server in the US, but I only tunnel my web traffic over an ssh connection. If anyone wants a shell on my server for tunneling purposes (and not downloading porn) contact me.

Setting up SSH is a bit quirky so most people are better off with a true VPN solution.

One that comes recommended is StrongVPN. By going with them you'll get full support and they show you how to set it all up.

2. Install free but ad-supported Hotspot Shield

From their site:

Secure your web session, data, online shopping, and personal information online with HTTPS encryption.
Protect yourself from identity theft online.
Hide your IP address for your privacy online.
Access all content privately without censorship; bypass firewalls.
Protect yourself from snoopers at Wi-Fi hotspots, hotels, airports, corporate offices.

You may want to install ad blockers if you go this route. They will also track information about you to sell to advertisers.

3. Proxy servers.

Pick a proxy server from http://www.xroxy.com/ and set your browser to use it without needing to buy or install anything. You don't need to use a proxy server in Vietnam, in fact it's probably better not to.

In a pinch you can browse through a "CGI proxy" like http://12345proxy.com/ without having to set up anything.

Using a proxy server could slow down access to some websites, especially ones in Vietnam. You can install some browser add-ons so that you only go through a proxy for the sites that are blocked, like Facebook.

For Google Chrome:
Proxy Switchy: https://chrome.google.com/extensions/detail/caehdcpeofiiigpdhbabniblemipncjj

For FireFox:
FoxyProxy: https://addons.mozilla.org/en-US/firefox/addon/2464/

4. Just for watching videos on sites like Hulu, Amazon Video on Demand, Pandora, or YouTube, you can try http://www.usvideo.ca/ although it costs $5.25/month.