[Plugin: Embedly] Doesn't seem to embed anything?

Maybe i’m just an idiot, but the example given in the about section of this plugin looks pretty idiot-proof.

So I’ve tried putting in a hyperlink with the address still attached between the a-tags.

<a href='https://twitter.com/#!/wired/status/38017736000933889'>https://twitter.com/#!/wired/status/38017736000933889</a>

But the plug-in doesn’t seem to “embed it”, it just functions like any other hyperlink.

I’ve checked the plugin settings to make sure that twitter is selected as one of the services I want enabled for embedding, but it doesn’t seem to be doing anything.

It’s a really neat plugin and I wish it would work.
Thanks