Starting today, you can use Skype even if you don't have an account. The Microsoft-owned service announced a new feature that makes this possible. People who do have a Skype account can now start a conversation and then share a unique link to it. Each conversation gets its own link, and the people who are sent such a link (and click on it) can join it and chat even if they're not Skype users. This currently works for guests through Skype for Web on computers.
The people inviting others to conversations through these links can do so from Skype for Windows, Skype for Mac, and Skype for Web. The functionality is currently limited to the US and UK. Guests can also join conversations from Skype for iPhone, iPad, and Android, but only if they already have an account.
Skype says it's working hard to roll out this feature to the rest of the world too, and this should happen over the next two weeks. The ability to start a conversation and share a link to it from mobile devices is coming soon.