You can use Go with Google AppEngine [1], though it's experimental. AppEngine also supports Python and Java. It's a nice environment to experiment with Go, since you'll get quite a bit of free bandwidth / storage [2] to start out with:
> "Not only is creating an App Engine application easy, it's free! You can create an account and publish an application that people can use right away at no charge, and with no obligation. An application on a free account can use up to 1 GB of storage and up to 5 million page views a month. When you are ready for more, you can enable billing, set a maximum daily budget, and allocate your budget for each resource according to your needs."
> "Not only is creating an App Engine application easy, it's free! You can create an account and publish an application that people can use right away at no charge, and with no obligation. An application on a free account can use up to 1 GB of storage and up to 5 million page views a month. When you are ready for more, you can enable billing, set a maximum daily budget, and allocate your budget for each resource according to your needs."
[1]: https://developers.google.com/appengine
[2]: https://developers.google.com/appengine/docs/whatisgoogleapp...