There are many things that can happen in the world that effect the way the internet runs. A great site to keep an eye on if you ever want to know if a service you use is working.
The Internet is made up of many thousands of networks and servers all linked together. If one of those networks is down or a DNS provider is having issues it may be stopping you from reaching our servers. Here’s a quick way to check:
http://www.downforeveryoneorjustme.com
For many of our blog hosting clients who might access the WordPress Site for plugins and related items check out http://status.automattic.com/9931/135469/WordPress.com for their status.