The whole world is keeping watch over the Skype's destiny since the world's most famous service technical issues couldn't escape notice. Users all over the world have some difficulty while trying to connect to the service.
Microsoft (the Skype owner) is in the loop of the whole situation at the moment and the service technicians „detected an issue with the status settings“ which is claimed to show any user status (online/offline). The support staff does its best to perform a quick error fix.
It's good news that „the status issue also doesn't affect Skype for web, which can be used to make calls and send instant messages.“ So you can use that way to keep in touch with the important people.
Microsoft reports about any update via its Twitter. Here is what the stated 2 hours ago: „We are working to fix an issue which is preventing some users from logging in & using Skype. We apologize for any inconvenience.“