In the last hours it is being informed of multitude of users that can not access their blogs hosted on WordPress.com .
The problem seems to be motivated because WordPress.com has blocked the IPs of the service provider (ISP) Sky Network which manages traffic from Europe to the US and other countries.
This has been because WordPress.com has detected IPs, coming from that provider , which could be a danger to your servers so have blocked the entire ISP at least for the time being.
So if you can not access your blog or even all WordPress .com may be because WordPress.com has your IP among the blocked.
We do not know anything else at the moment, so patience. In the meantime you can encourage to install your own WordPress the .org, the authentic one, and thus not depend on the decisions of others in the future. And if nothing, wait.